Plus Two Botany Chapter Wise Previous Questions Chapter 8 Environmental Issues

Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 8 Environmental Issues.

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 8 Environmental Issues

Question 1.
Destruction of forest leads to the increase of CO, in atmosphere. Recently Govt, of India instituted an award for individuals or communities from rural areas that shown extraordinary courage and dedication in protecting wildlife. (MARCH-2010)
a) Identify the award.
b) Comment on deforestation and reforestation.
Answer:
a) Amrita Devi Bishnoi award
b) Deforestation cutting down of forest trees Reforestation replanting trees which are already destroyed.

Question 2.
Industrial effluents and domestic sewage seriously affect fresh water bodies. For protecting aquatic life Govt, of India recently declared an animal as National aquatic animal. (MARCH-2010)
a) Identify the animal.
b) Distinguish biomagnification from eutrophication.
Answer:
a) Dolphin
b) Bio magnification is the increase in the amount of non biodegradable substance in successive trophic level in a food chain.
Eg: DDT Eutrophication is the overgrowth of aquatic plants as a result of accumulation of nutrients in water body.

Question 3.
In 1990s, Delhi ranked 4th among the most polluted cities of the world. But now air quality of Delhi has significantly improved mainly by switching vehicles from diesel to CNG. (MAY-2010)
a) Expand CNG.
b) CNG is betterthan diesel. Comment.
Answer:
a) Compressed Natural Gas
b) CNG is compressed natural gas. It burns more efficiently than Petrol and diesel, thus brings down the amount of pollutants from automobiles (unbumt hydrocarbons).

Question 4.
Greenhouse effect is a naturally occuring phenomenon that is responsible for heating of earth’s surface and atmosphere. (MAY-2010)
a) Explain greenhouse effect.
b) What will happen if there is absolutely no greenhouse effect over earth’s surface ?
Answer:
a) The greenhouse gases such as CO2, N20, Methane present in the atmosphere will reradiate the reflected infrared radiations. Thus raising the temperature of earth.
b) It will affect the climate of earth as the greenhouse effect causes melting of snow in the polar regions. This will in turn determine the level of water in the sea.

Question 5.
Arrange the following words into suitable categories in the given table. (MARCH-2011)
Algal bloom, Catalytic converter, Eichhornia, Electrostatic precipitator
Plus Two Botany Chapter Wise Previous Questions Chapter 8 Environmental Issues 1
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 8 Environmental Issues 2

Question 6.
Geetha resides in a city nearby a lake. Water from this lake was used for various domestic purposes earlier. Now-a-days. this water has become turbid and is with an unpleasant odour. (MARCH-2011)
a) What can be the reason for this ?
b) Name the scientific term that explains this effect.
Answer:
a) Nutrient enrichment
b) Eutrophication or Aging of lake

Question 7.
As Head of the Vehicle Department, issue a notice to vehicle owners to observe any two measures to reduce vehicular air pollution and record the merits and demerits of CNG. (MAY-2011)
Answer:
Use of catalytic converter.
Use of lead-free petrol or diesel.
Merits of CNG
1) It burns most efficiently,
2) It is cheaper than petrol or diesel, cannot be siphoned off by thieves and adulterated like petrol or diesel.
Demerits of CNG
It is difficult of laying down pipelines to deliver CNG through distribution points/pumps and ensuring uninterrupted supply.

Question 8.
increase in green house gases. Name two green house gases. (MAY-2011)
Answer:
Green house gases – CO2 and CFC

Question 9.
The increased use of chemicals like CFCs (Chloro fluro carbons) cause adverse ecological impacts. Why CFCs are considered harmful to the environment? Mil It causes the depletion of ozone layer. (MARCH-2012)
Answer:
CFC is considered as green house gas.lt causes global warming.
The incoming UV rays cuases many diseases like skin cancer,snow blindness etc.

Question 10.
Meena an environmental activist, noticed a gradual decline in the’population of birds in the open agricultural fields near her place. She has heard of the excessive use of pesticides like DDT around that area. (MARCH-2012)
a) What might have led to the decline of bird population in that area?
b) Name the process that has caused this phenomenon.
Answer:
a) It disturbs calcium metabolism in birds due to accumulation of DDT and causes the thinning of egg shell. lt affects the premature breaking of egg.
b) Biomagnification.

Question 11.
Ammu read in the newspaper that, BOD of a water body in a nearby village was high and there is algal bloom. (MAY-2012)
a) What is BOD ?
b) What is algal bloom ?
c) Can you give possible reason for these phenomenon?
Answer:
a) Biological oxygen demand
b) Inceased algal population
c) It is due to the accumulation of inorganic nutrients like phosphate and nitrate in water body

Question 12.
Enviornmentalists usually says: There are many causes for biodiversity losses’. Illustrate four major causes of biodiversity loss. (MARCH-2013)
Answer:
i) Habitat loss and fragmentation
ii) Over-exploitation
iii) Alien species invasions
iv) Co-extinctions

Question 13.
In a study conducted, the concentration of DDT was found to increase in the successive trophic levels, The results of the study is shown below: (MAY-2013)
Plus Two Botany Chapter Wise Previous Questions Chapter 8 Environmental Issues 3
Answer:
Biomagnification
High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations.

Question 14.
An article in the newspaper reports that ‘Refirigerants like Chlorofluorocarbons (CFCs) pose threat to the environment’. How CFCs are harmful to the environment? (MARCH-2014)
Answer:
CFC (CCI2F2) splits in the presence of UV and release active chlorine. This active chlorine breaks ozone molecule into O2 and (O) .It causes the thinning of stratospheric good ozone and harmful UV rays reaches earth surface.

Question 15.
Now a days many farmers are interested in organic farming. What is meant by organic farming? Can you suggest any two advantages of organic farming?  (MARCH-2014)
Answer:
It is the cyclical, sustainable and zero-waste procedure.
Advantageous
1) No need of chemical fertilizers.
2) No need of insecticides and pesticides.
3) Never kills microorganisms in the soil.

Question 16.
An aquatic ecosystem having luxurious growth of cyanobacteria (Algal bloom) leads to eutrophication.  (MARCH-2015)
a) What kind of pollutants cause algal bloom to colonize the aquatic ecosystem?
b) What are the consequences of eutrophication?
Answer:
a) Waste water contains contains large quatities of nutrients.
b) It causes ageing of lake and damage to indigenous flora and fauna.

Question 17.
During the past century, the temperature of the earth has increased by 0.6°C, most of it during the last few decades. Rise in temperature causes deleterious changes in the environment, thus leading to increased melting of polar ice caps as well as other places like Himalayan snow caps. Suggest any two control measures that will reduce global warming?  (MARCH-2015)
Answer:
1) Cutting down use of fossil fuel
2) limproving efficiency of energy usage
3) Reducing deforestation
4) Planting trees and slowing down the growth of human population.

Question 18.
Observe the diagram and answer the following:  (MAY-2015)
Plus Two Botany Chapter Wise Previous Questions Chapter 8 Environmental Issues 4
a) Suggest the reasons for the presence of DDT in the water.
b) Fish eating birds of this area have higher DDT concentration in their body. Justify.
c) What will be the impact of DDT in the birds?
OR
United Nations Framework convention on climate change, an international treaty signed by 194 countries to cooperatively discuss global climate change and its impact.
As a science student,
a) What is global warming?
b) Explain the reasons and give suggestions to control global warming?
Answer:
a) Use of pesticide in agricultural field
b) DDT is accumulated in successive trophic level and finally its concentration is very high fish eating birds.
c) DDT affect calcium metabolism, that causes thinning of eggshell and premature breaking of egg. Hence the bird population is decreased.
OR
a) Increasing the temperature of earth surface due to green house effect is called global warming
b) The incoming radiations of sunlight reaches the earth’s surface re-emits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (e.g., carbon dioxide, methane,CFCand nitrogen oxides) absorb a major fraction of it. This cycle is repeated many a times and temperature of earth increases it leads to global warming.
It is reduced by

  1. cutting down use of fossil fuel.
  2.  improving efficiency of energy usage.
  3. reducing deforestation.
  4. planting trees and slowing down the growth of human population.

Question 19.
Increase in the concentration of toxicants at successive trophic level is called _____.  (MARCH-2016)
a) BOD
b) Biomagnification
c) Eutrophication
d) Algal Bloom
Answer:
b) Biomagnification

Question 20.
The major pollution in the environment is caused by automobiles. Expand the term CNG. Mention any two of its merits. (MARCH-2016)
Answer:
CNG – compressed natural gas It burn efficiently
It is cheaper than diesel and petrol

Question 21.
Temperature is generally increasing making the earth a hot plate. Mention any two measures to control global warming. (MARCH-2016)
Answer:
Cutting down the use of fossil fuel
Improving the efficiency of energy usage

Question 22.
Quantity of pollutants increase in successive trophic levels. Observe the flowchart regarding biomagnifications of DDT in an aquatic food chain and answerthe following: (MAY-2016)
a) What is biomagnification?
b) What are the consequences of biomagnification?
Plus Two Botany Chapter Wise Previous Questions Chapter 8 Environmental Issues 5
Answer:
a) Non bio degradable chemicals which accumulate in the body of organism and is passed on to the organisms belonging to the next trophic level, the increase in the concentration of toxicants at successive trophic level and finally concentration become high in last trophic level of the food chain.
b) High concentrations of DDT disturb calcium metabolism in birds, which causes the thinning of eggshell and their premature breaking, causing decrease in bird populations.

Question 23.
Adequate waste management is an environment issue to be considered. Discuss the advantages of Eco-san toilet. (MAY-2016)
Answer:
it is a sustainable system for handling human excreta, using dry composting toilets.
This is a practical, hygienic, efficient and cost- effective solution to human waste disposal.

Question 24.
A common cause of deforestation is slash and burn agriculture. (MARCH-2017)
a) What is the common name attributed to such type of cultivation?
b) Explain how this type of cultivation is practised?
Answer:
a) phytoplankton stage
b) Submerged plant stage
c) Submerged free floating plant Stage
d) Reed swamp stage
f) Marsh – meadow stage
g) Scrub stage
h) Forest stage

Question 25.
Particulate matter in polluted air is removed by the application of electrostatic precipitator. Explain the working principle of lectrostatic precipitator. (MARCH-2017)
Answer:
At high voltage the electrons produced in an instrument are attached to dust particles giving them a net negative charge. These charged dust particles are attracted by collecting plates. Then reducing the velocity of air between the plates which help the dust to fall. Electrostatic precipitator which can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant.

Question 26.
Among the following which one Is used for reducing the emission of poisonous gases from automobiles (MAY-2017)
a) Landfills
b) Catalytic converter
c) Electrostatic precipitator
d) Earmuffs
Answer:
Catalytic converter

Question 27.
Nutrient enrichment in a fresh water lake leads to (MAY-2017)
eutrophication.
a) What happens during eutrophication?
b) How dissolved oxygen level is affected as a result of this?
Answer:
a) Due to accumulation of nitrate and phosphate into the lake, leads the rapid growth of algae, that changes the colour and quality of water.
It depletes the oxygen content of water and finally causes the death of aquatic organs.
b) Due the death and decay of algae, dissolved oxygen content is decreased in lake that causes the mortality of fish and other aquatic organs.

Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem

Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 7 Ecosystem.

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem

Question 1.
During a study tour teacher showed the primary colonisers on the banks of the river ‘Nila’.(MARCH-2010)
a) Identify the succession and justify your answer.
b) List the different stages of the identified succession.
Answer:
Succession taking place in water is called Hydrarch.
b) Phytoplankton stage -> Submerged plant stage -> Submerged free floating plant stage -> Reed swamp stage -> Marsh meadow -> Scrub stage -> Forest stage

Question 2.
While learning trophic levels in class-room, teacher asked you to explain ‘standing crop’ to Raman. Explain. (MARCH-2010)
Answer:
Standing crop – The mass of living material present in each trophic level.

Question 3.
Pond is a self-sustainable unit. Some organisms related to pond ecosystem is listed below, tadpole, fish, water, plants, kingfisher. (MAY-2010)
a) Construct a food chain with the listed organisms.
b) Explain trophic level.
c) Point out trophic level of each organism in the constructed food chain.
d) Name interconnection of food chains in nature.
OR
Two students, Unni and Kannan studied inter specific interactions between different species. They made a table assigning a ‘+’ for beneficial interaction, for detrimental and ‘0’ for neutral interaction. Can you help them by naming the interaction between species in different cases ? Write one example for each interaction.

Case number Species A Species B
1. + +
2.
3. +
4. + 0

Answer:
Water plants Tadpole -> Fish -> Kingfisher
b) Specific place of an organism in the food chain based on the source of nutrition or food.
c)
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 1
d) Food web
OR
1-Mutualism Eg; Lichen
2-Competition
Eg: Competition for food (Phytoplankton) between Flamingoes and fishes
3 – Predation Eg: Lion and Deer
4 – Commensalism
Eg: Epiphyte, Vanda and Mango tree

Question 4.
Consider pond as an ecosystem showing the number of individuals in the following categories. (MARCH-2011)
Carnivores-2500, Producers-15000, Herbrivores- 5000
a) Draw the pyramid of numbers in this ecosystem.
b) Comment on the energy flow in the ecosystem
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 2
b) Unidirectional flow of energy from producers to consumers. It decreases in successive trophic levels

Question 5.
The gradual change in the species composition of a given area leading to the formation of climax community is called ecological succession. In a rocky area, (MARCH-2011)
a) What is the expected type of pioneer species?
b) How this pioneer species leads to the establishment of a stable climax community?(2 Scores)
Answer:
a) lichens
b) lichens -> mosses -> herbs -> shrubs ->forest.
These are different stages and leads to stable climax community.

Question 6.
Fill up the blanks with appropriate terms in the given pyramid of trophic level: (MAY-2011)
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 3
Answer:
b – Primary consumer a- secondary consumer

Question 7.
Kalyani wrote man, hen, earthworm, mango-tree in her note book. Arrange the terms in a food chain sequence. Explain food chain and name the types of food chain. (MAY-2011)
Answer:
Earth worm—> Hen —> Man —> Mango tree
The transfer of food from the producers through a series of organisms with repeated eating and being eaten is referred to as Food chain Detritus food chain

Question 8.
In a marine ecosystem, a population of phytoplankton (150,000) supports a standing crop of fishes (40,000). (MARCH-2012)
a) Draw the pyramid of biomass and
b) The pyramid of numbers in this ecosystem,
Answer:
a) Inverted Pyramid
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 4
b) Upright Pyramid
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 5

Question 9.
The gradual and fairly predictable changes in the species composition in an area is called ecological succession. (MARCH-2012)
a) Name the pioneer species in the primary succession in water.
b) Give the sequence of events and climax community in the hydrarch succession.
Answer:
a) Phytoplankton
b) Phytoplankton -> submerged free floating -> Reed swamp marsh meadow -> scrub -> Forest.

Question 10.
Given number of individuals in a grassland ecosystem. (MAY-2012)
Grasshopper – 1500
Grass – 5,842,000
Wolf – 28
Birds – 215
a) Draw a pyramid of numbers showing various trophic levels.
b) Explain trophic level.
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 6
b) Each step in food chain is called trophic level

Question 11.
Rate of biomass production is called productivity and can be divided into GPP and NPP : (MAY-2012)
a) Define GPP and NPP.
b) How can we relate GPP and NPP?
Answer:
a) GPP – Gross primary productivity NPP – Net primary productivity
b) NPP = GPP-R

Question 12.
Final community that is in near equilibrium with environment in ecological succession is called ________. (MARCH-2013)
Answer:
Climax community

Question 13.
Natural interlinked food chains are called _______. (MARCH-2013)
Answer:
Food web

Question 14.
A list of organisms are given. Place them in different trophic levels. Grass, Man, Fishes, Birds, Lion, Grasshopper, Zooplankton, Trees. (MARCH-2013)
Answer:
First trophic level – trees, grass
Second trophic level – grasshopper, zooplankton
Third trophic level – birds, fishes
Fourth trophic level – lion, man

Question 15.
In the equation, GPP-R = NPP; If NPP = Net primary productivity. (MAY-2013)
Explain GPP – R = NPP.
Answer:
Gross primary productivity minus respiration losses (R) is the net primary productivity (NPP).
That means Net primary productivity is the available biomass for the consumption of heterotrophs (herbivores and decomposers).

Question 16.
The teacher, pointing to a forest said “ Long back, this place was a pond’’. This gradual change is an example of (MAY-2013)
1) Secondary succession
2) Xerarch succession
3) Pioneer species
4) Hydrarch succession
Answer:
Hydrarch succession

Question 17.
The species that invade a nude area are called ________ species. In a primary succession on rocks, the group that invade first are usually. (MARCH-2014)
Answer:
Pioneer species, Lichens

Question 18.
The rate of biomass production in an ecosystem is called productivity. They are of two types, gross primary productivity and net primary productivity, how these two productivities are related? (MARCH-2014)
Answer:
Gross primary productivity of an ecosystem is the rate of production of organic matterduring photosynthesis.
Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP).
i.e: GPP – R = NPP

Question 19.
A list of different organisms in an ecosystem are given below. (MARCH-2014)
Arrange them in 1st, 2nd, 3rd and 4th trophic level,
i) Phytoplankton
ii) Man
iii) Fish
iv) Zooplankton
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 7

Question 20.
By observing the relationship of the first pair fill up the blanks: (MAY-2014)
a) Grazing food chain consists of producers and consumers whereas Detritus chain comprises dead organic matter and ______.
b) Nitrogen : Gaseous cycle
Sulphur: _______
Answer:
a) Detrivores
b) Sedimentary cycle

Question 21.
Field survey by a team of students recorded the following data related to biomass of the organisms in each tropic level of an ecosystem. Draw, name and explain the pyramid (MAY-2014)
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 8
Biomass increases in successive trophic levels hence the pyramid given here is inverted.

Question 22.
Gradual, sequential changes of a given area including species composition is known as ecological succession. If so name the first two stages of the succession in hydricarea. (MAY-2014)
Answer:
1) phytoplankton stage
2) submerged plant stage

Question 23.
Primary succession on rocks is known as Xerosere. Answer the following related with Xerosere. (MARCH-2015)
a) Name the pioneer community.
b) Organic acids have important roles in this succession. Justify.
Answer:
a) Lichen
b) It helps in weathering of rocks and soil formation

Question 24.
By observing the relationship of the first pair fills up the blanks. (MAY-2015)
a) Net primary productivity =
Gross primary productivity — Respiration.
Gross primary productivity is ________.
b) Carbon: Gaseous cycle
Phosphorus: ______.
Answer:
a) total organic matter
b) sedimentary cycle

Question 25.
Field survey by a team of students recorded the following data related to number of organisms in an ecosystem and plotted that into a figure shown below: (MAY-2015)
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 9
Observe the figure and explain the pyramid.
Answer:
It is the inverted pyramid . In this number of organism increases in the successive trophic levels.

Question 26.
Hydrosere succession stages are given below. Arrange them in order. (MAY-2015)
Scrub stage — forest —submerged free floating — Marsh Meadow —Submerged stage —Reed swamp—Phytopiankton.
Answer:
Phytoplankton- submerged-submerged free floating- reed swamp -Marsh meadow -srub stage – forest.

Question 27.
Nutrients are never lost from the ecosystems and are recycled. Write about. (MARCH-2016)
a) Gaseous cycle
b) Sedimentary cycle
Answer:
a) Gaseous cycle- The reservoir of gaseous type nutrients are present in atmosphere
b) Sedimentary cycle- The reservoir of nutrients are present in earth crust

Question 28.
Ecological pyramids are usually upright. Meanwhile some, pyramid of biomass is inverted. Explain the reason. (MARCH-2016)
Answer:
Pyramid of biomass of sea is inverted because biomass of fishes far exceeds phytoplankton

Question 29.
a) Biogeochemical cycle is an important phenomenon in very ecosystem. Describe phosphorus cycle. (MAY-2016)
OR
b) The plant communities in a given area show successive changes. Mention the stages of succession in a xerosere.
Answer:
a) The cycle consists of following steps.
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 10
OR
b) In xerach succession first plant communities appear in bare area are lichens,They secrete
carbonic acid and dissolve rocks. This process forms soil that help in the growth of mosses. Then herbs,shrubs and forest stage appears .this process takes thousands of years and form climax community.

Question 30.
Earthworms are commonly referred as farmers’ friends. Define fragmentation. (MAY-2016)
Answer:
During fragmentation large detritus (dead remains of plants & animals) is converted into into smaller particle by the detritrivores like earthworm, its surface area increases that helps in process, of decomposition.

Question 31.
The different stages of primary succession in water are represented below. Fill the gaps that are unfilled. (MARCH-2017)
a) Phytoplankton
b) _______
c) Submerged free floating plant stage
d) _______
e)________
f) Shrub stage
g) _______
Answer:
a) phytoplankton stage.
b) Submerged plant stage.
c) Submerged free floating plant Stage
d) Reed swamp stage.
f) Marsh – meadow stage
g) Scrub stage.
h) Forest stage

Question 32.
An ecosystem consist of the following population: (MARCH-2017)
Phytoplankton
Man
Fish
Zooplankton
Draw a food chain denoting each trophic level
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 11

Question 33.
The natural reservoir of phosphorous is rock where it is present in the form of phosphates. How this phosphorous is cycled in ecosystem? (MAY-2017)
Answer:
The reservoir of phosphorus is rock. During weathering process orthophosphates reaches the soil solution. It is taken by plants, that passes through food chain and reaches animals. After the death and decay, the organic form of phosphorus is coming into the soil solution as orthophosphates by the activity of phosphate solubilising bacteria.

Question 34.
Birds represent members in a food chain. (MAY-2017)
Draw a food chain representing each of the above in different tropic levels.
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem 12

Plus Two Botany Chapter Wise Previous Questions Chapter 6 Organisms and Populations

Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 6 Organisms and Populations.

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 6 Organisms and Populations

Question 1.
Given below is a table which shows the interspecific interaction.’+’ sign indicates beneficial,sign indicates detrimental and ‘0’ indicates neutral. (MARCH-2010)
a) Fill in the blanks.

Species A Species B Interaction
Competiton
0 …………….
+ 0 ……………

b) Name the interactions where one species is benefited and the other is detrimental.
Answer:
Amensalism
Commensalism

Question 2.
Small bottle labelled with rDNA insulin. (MARCH-2010)
a) Does it a natural insulin ?
b) Identify the major steps involved in this rDNA insulin production.
Answer:
No.
1. Isolation of desired genes.
2. Insertion of desired Genes into plasmids of E. coli.
3. Introduction of plasmids into E coli cells.
4. Culture of E coli cells.
5. After this, a polypeptide chains A and B are separated and connected together by disulphide linkages.
Thus, genetically engineered insulin is prepared
Plus Two Botany Chapter Wise Previous Questions Chapter 6 Organisms and Populations 1

Question 3.
Given below a schematic representation with circles and squares, which shows four factors/processes influence the population density. (MARCH-2010)
Write the positive factors in circles and negative factors in squares.
Plus Two Botany Chapter Wise Previous Questions Chapter 6 Organisms and Populations 2
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 6 Organisms and Populations 3

Question 4.
Snakes change their body temperature with changes in external temperature, but human beings not. Organism may be classed according to above character with explanation. (MAY-2010)
Answer:
Temperature has a significant role in the kinetics of enzymes and thus influence the metabotic activities and physiological functions. Accordingly organisms can be classified into eurythermal (tolerate wide range of temperature) and Stenothermal (restricted to narrow range of temperature)

Question 5.
Density of a population in a given habitat during a given period, fluctuates due to changes in 4 basic processes – Natality, Mortality, Immigration & Emigration. (MAY-2010)
a) Differentiate Natality and Mortality.
b) Differentiate Immigration and Emigration.
Answer:
a) Mortality is the number of death of a population at a given period and Natality is the number of birth during a given period.
b) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period. Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period.

Question 6.
Plus Two Botany Chapter Wise Previous Questions Chapter 6 Organisms and Populations 4
Given above is the bar diagram showing age structure of three different populations. Observe the diagram carefully and answer the following questions. (MARCH-2011)
a) Select the stable population.
b) Compare the nature of population growth in A,B, and C

Answer:
a) ‘B’Stable population
b)

A B C
Expanding Positive growth Stable Zero growth Declining negative growth

Question 7.
By observing the relationship of the first, fill in the blanks. (MARCH-2011)
a) Unisexual male flower-Staminate ______
Unisexual female flower ______
b) Organisms tolerating a wide range of temperature – eurythermal
Organisms tolerating a narrow range of temperature ______
Answer:
a) pistillate
b) stenothermal

Question 8.
Population interactions: (MAY-2011)

Case Species x Species y Species z
1 + + 0
2 0 +
3 +

Where’+’ beneficial interaction detrimental interaction ‘0’ neutral interaction.
Observe the interactions of populations of 3 species as shown in the table. Name the interactions
a) Species x and species y in case 1.
b) Species y and species z in case 2.
c) Species x and species z in case 3.
d) Species y and species z in case 1
Answer:
a) Mutualism
b) Predation/Parasitism
c) Competition
d) Commensalism

Question 9.
Mohammed and his family left to Dubai from Kozhikode on March, 2009. In Kozhikode they are referred as after 2009. How it affects Kozhikode population? (MAY-2011)
Answer:
Emigrants, Decrease the size of population

Question 10.
Inter specific interaction from the interaction of populations of two different species. If we assign + for beneficial, — for detrimental and 0 for neutral interactions, copy and complete the following chart. (MARCH-2012)

Species A Species B Name of interaction
…………… …………………. Mutualism
…………..
……………. …………………. Commensalism
……………. ……………………. Amensalism
+ ………………

Answer:

Species A Species B Name of interaction
+ +
Competition
+ 0
0
Parasitism /predation

Question 11.
Prakash parked his car in bright sunlight for a few hours, with glass windows fully raised. After sometime inside of the car was very hot. (MAY-2012)
a) Name the phenomenon.
b) How can you correlate this phenomenon with global warming?
Answer:
a) Green house effect
b) The green house effect is due to various green house gases, of which the percentage of carbon dioxide is very high. This causes the increase of temperature on earth called Global warming.

Question 12.
Students involved in nature club activity found some interspecific interactions between organisms in a garden area. They made a table of interaction giving’+’ for beneficial interaction,for detrimental and ‘O’ for neutral interaction. (MAY-2012)

Sno Species A Species B
i. + +
ii.
iii. + 0
Iv 0

a) Give name of interaction in each case.
b) Explain how parasitism differ from predation.
c) Give the significance of species interaction.
Answer:
i – Mutualism
ii – competition
iii – commensalism
iv- amensalism
b) In parasitism, parasite absorb nutrients from the living host In predation, predator kills and eat the prey.
c) Species interaction is beneficial, detrimental or neutral (neither harm nor benefit) to one of the species or both.

Question 13.
Read the statements below and identify the mode of interaction between the species. (MARCH-2013)
a) Tiger eating deer
b) Butterfly feeding pollen
c) Human liver fluke feed on snail
d) Lice on humans
e) Orchid attached to a tree
f) Mycorrhizal association of fungi and roots of higher plants.
g) Sparrow eating seed
h) Egrets foraging close to cattle
Answer:
a) predation
b) mutualism
c) predation or parasitism
d) parasitism
e) commensalism
f) mutualism
g) predation
h) commensalism

Question 14.
In summer we use air conditioners and in winter we use heaters. Here homeostasis is accomplished by artificial means. Explain four ways by which other living organisms cope with the situation. (MARCH-2013)
Answer:
Hibernation – winter sleeping
Aestivation – Summer sleeping
Migration – Moving into more suitable area
Diapause – inactive in adverse condition

Question 15.
Many desert plant have adaptations to prevent loss of water from their body. Mention any two adaptations to minimise water loss from plant body. (MAY-2013)
Answer:
a) Many desert plants have a thick cuticle on their leaf surfaces and have their stomata arranged in deep pits to minimise water loss through transpiration.
b) They also have a special photosynthetic pathway (CAM) that enables their stomata to remain closed during daytime.

Question 16.
The size of a population is not static. Which of the following leads to decrease in population? (MAY-2013)
1) Natality and Mortality
2) Mortality and Emigration
3) Mortality and immigration
4) Natality and Immigration
Answer:
Mortality and Emigration

Question 17.
Some type of Orchids live on the branches of Mango trees. The relationship between mango tree and Orchid is an example of. (MAY-2013)
1) Mutualism
2) Predation
3) Commensalism
4) Parasitism
Answer:
Commensalism

Question 18.
The density of population in a given habitat increase or decrease due to different reasons. Name two factors responsible for increase in population in a given area. (MARCH-2014)
Answer:
Natality and Immigration

Question 19.
Observe the diagram:(MAY-2014)
Plus Two Botany Chapter Wise Previous Questions Chapter 6 Organisms and Populations 5
Define the following terms:
a) Natality
b) Mortality
c) Emigration
d) Immigration
Answer:
a) Birth rate or total number of live births per 1,000 of a population in a year.
b) Death rate or total number of death per 1,000 of a population in a year.
c) Emigration- movement of individuals out of the population
d) Immigration- movement of individuals into the population

Question 20.
Response of organisms to abiotic stress involves different methods. Explain any two such responses with suitable examples. (MAY-2014)
Answer:
i) Regulate: Organisms are able to maintain constant body temperature and constant osmotic Concentration. Eg- birds and mammals
ii) Conform: Organisms cannot maintain a constant internal environment.
Eg- Majority (99 percent) of animals and all plants.

Question 21.
Suckerfish and shark live in close association, is a classic example of commensalism. What is commensalism? (MARCH-2015)
Answer:
Commensalism -This is the interaction in which one species benefits and the other is neither harmed nor benefited.

Question 22.
Desert plants like Opuntia are able to grow in extreme conditions. Suggest any two adaptations of this plant. (MARCH-2015)
Answer:
1) They have a thick cuticle on their leaf surfaces
and have their stomata arranged in deep pits to minimise water loss through transpiration.
2) They also have a special photosynthetic pathway (CAM) that enables their stomata to remain closed during day time
3) The photosynthetic function is carried out by the flattened stems.

Question 23.
With regard to population growth rate, when responses are limiting the plit is logistic. Verhulst-Pearl Ligstic growth is represented by the equation. (MARCH-2015)
\(\frac{\mathrm{d} \mathrm{N}}{\mathrm{dt}}=\mathrm{rN} \frac{(\mathrm{K}-\mathrm{N})}{\mathrm{K}}\) what,are
a) r
b) K
Answer:
a) r-lntrinsic rate of natural increase or( b-d)
b) k-Carrying capacity

Question 24.
Observe the equation (MAY-2015)
\(\frac{\mathrm{d} \mathrm{N}}{\mathrm{dt}}=\mathrm{rN} \frac{(\mathrm{K}-\mathrm{N})}{\mathrm{K}}\)
a) Which type of growth curve does it represents?
b) What do the following notations represent:
a) N b) r c) K
Answer:
a) Logistic growth
b) N-population of size
b) r- intrinsic rate of natural increase
c) K-Carrying capacity

Question 25.
On earth, life exists even in extreme and harsh conditions. Mention any two major biomes in India. (MARCH-2016)
Answer:
Tropical deciduous forest
Rain forest

Question 26.
a) Population interactions may be beneficial or not. Write any three interactions in detail. (MARCH-2016)
OR
b) Organism are influenced by biotic and abiotic factors. Write an account of any three abiotic environmental factors.
Answer:
a) Mutualism- in this both partners are benefitted eg lichen (+,+)
Commensalism- In this one partner is benefitted other partner is neither benefitted nor harmed (-, +) Competition- In this both partners have detrimental effect or negative effect (-, -)
OR
b) Temperature- it affect the enzyme kinetics of reaction. Enzyme works at optimum temperature
Water- it affect productivity and distribution of plants in aquatic ecosystem.
Light- It influence the photoperiodic flowering of plants

Question 27.
Population growth may be exponential or logistic. Differentiate between them. (MAY-2016)
Answer:
When the resources in the habitat are unlimited, each species has the ability to grow in number. Here the population grows in an exponential or geometric fashion. dN/dt = rN
Limited resources leads to competition between individuals and the ‘fittest’ individual will survive and reproduce. This is called logistic growth
\(\frac{\mathrm{d} \mathrm{N}}{\mathrm{dt}}=\mathrm{rN} \frac{(\mathrm{K}-\mathrm{N})}{\mathrm{K}}\)

Question 28.
Plants are adapted to grow in different habitats. Name any four adaptations of plants in desert habitat. (MAY-2016)
Answer:
Desert plants have a thick cuticle on their leaf surfaces and stomata arranged in deep pits to minimise water loss through transpiration.
They also have CAM pathway in which they open stomata during night and closed during day time.

Question 29.
In a given habitat, the maximum number possible for a species is called _________ of that species in that habitat. (MARCH-2017)
Answer:
Carrying capacity (K)

Question 30.
Different types of population interaction has been observed in a population. (MARCH-2017)
Write the types of interaction observed among the following species:

Species A Species B Type of interaction
Orchid ophrys Bees ——————
Cattle Cattle egret ——————
Sea anemone Clown fish ——————-
Ticks Dogs ——————–
Cuscuta Hedge plant ——————-
Tiger Deer ——————–

OR
B) Organisms other than human beings manage or adapt to stressful conditions by adopting different mechanisms. Explain any three mechanisms adopted by them to maintain the internal environment.
Answer:
A) Mutualism or pseudocopulation Commensalism Commensalism Parasitism Parasitism Predation
OR
B) 1) Conform : About 99% of animals and all plants cannot maintain a constant internal environment according to the external environment. They change their body temperature and osmotic concentration of body fluid when external environment changes.
2) Migrate : Some organisms move away temporarily from the stressful habitat to a more hospitable area and return when stressful period is over.
3) Suspend : Some organisms like bacteria, fungi and lower plants produce thick walled spores to tide over unfavourable conditions.
Some organism avoid the stress by escaping in time by method of hibernation during winter (eg. polar bear) or aestivation to avoid summer related problem (eg: snails and shells).

Question 31.
There are four mechanism by which living organisms other than human beings maintain the constancy of internal environment. Name these processes. (MAY-2017)
Answer:
Organisms maintain internal environment as constant by sweating shivering deposition of fat layer below skin and hairy covering on body surface.

Question 32.
Adaptations are the attributes of the organism that enables it to survive and reproduce in its habitat. Give the adaptations of  (MARCH-2014)
a) Cactus plant in desert
b) Kangaroo rat in desert
c) Seals in polar region.
Answer:
a) Desert plants have a thick cuticle on their leaf surfaces and have theirstomata arranged in deep pits to minimise water loss through transpiration
b) kangaroo rat in North American deserts is capable of meeting all its water requirements through its internal fat oxidation
c) In the polar seas aquatic mammals like seals have a thick layer of fat (blubber) below their skin that acts as an insulator and reduces loss of body heat.

Matchbox Questions and Answers Plus Two English Textbook Unit 1 Chapter 3 (Story)

Kerala State Board New Syllabus Plus Two English Textbook Answers Unit 1 Chapter 3 Matchbox Text Book Questions and Answers, Summary, Notes.

Kerala Plus Two English Textbook Matchbox Questions and Answers Unit 1 Chapter 3 (Story)

♦ Read and Respond (Textbook Page No. 17)

Question 1.
Why are women compared to matchboxes?
Answer:
They are compared to matchboxes because like matchboxes they too contain enough gun powder to make a hundred Lankas burn. But they sit around meek and innocent in the kitchen, in the pantry, in the bedroom, in fact in any place.

Question 2.
What makes Nomita furious?
Answer:
Ajit’s habit of reading letters addressed to her makes her furious. Sometimes he does not even show her the letters. She tried many things to stop him from that habit. She showed anger, took offence, tried to shame him and used sarcasm. Nothing worked. He just laughs it away.

Question 3.
What is the suspicion in Nomita’s mind?
Answer:
The suspicion in Nomita’s mid is that Ajit does not give her all the letters that are addressed to her.

Question 4.
What is called an ‘ugly habit’? Why?
Answer:
The habit of Ajit opening and reading the letters addressed to Nomita is called the ugly habit. He says that he does it because he wanted to make sure that someone does not send her love letters. She tried many things to stop him from this habit. But nothing worked.

Question 5.
How does Ajit react when Nomita mentions about his ugly habit?
Answer:
When Nomita mentions about his ugly habit he tries to laugh it away and if the laughter does not get him out of trouble, he scolds her.

Question 6.
What are the expectations of Nomita’s mother?
Answer:
Nomita’s mother needs money from Nomita and Ajit. In her letters she complains of the problems in her house. In the last letter she wrote that the ceiling of her room is cracked and the rainwater falls in. If this is not remedied she may die as the roof comes crashing down. She does not mind death. Herdaughter is a queen and her son-in-law is high minded and large-hearted. In short she wanted money to get the ceiling repaired.

Question 7.
Comment on Ajit’s attitude towards his mother-in-law.
Answer:
He has only contempt for her. How can a woman go on asking for help from her son-in-law? She always asks for money and then says her daughter is a queen. Ajit says Nomita’s mothen^a dung-picker. He says whenever letters come from her, there is no need to read them, but just go to the post office and fill in the money-order form!

Question 8.
What makes Nomita call Ajit a liar? Is her action justifiable?
Answer:
When Nomita asked Ajit why her letter was not given to her, he says he had just forgotten it. This makes Nomita call him a liar. Her action is justifiable. Nobody has a right to read the letter addressed to another person without his/her knowledge. Here Ajit not only reads the letters addressed to Nomita, he does not even give her the letters.

Question 9.
Comment on the simile in ‘Nomita hisses like a snake’.
Answer:
It is a fine simile. Nomita is very angry with Ajit for not showing her letter to her. She calls him a liar when he says he was planning to give it to her later. A snake hisses when it is very angry and when it is about to strike. Here Nomita hisses the word ‘liar’ as if a snake was hissing.

Question 10.
How do you think Ajit would react if Nomita reads the letters addressed to him?
Answer:
Ajit would be angry. If there is perfect love and understanding between the husband and wife, there is no harm in one reading the letters addressed to the other. However, etiquette forbids it. Moreover such perfect love can be found only in books!

Question 11.
What is the ‘poisonedknife’?
Answer:
The poisoned knife is the anger Nomita has shown. She calls him a common, vulgar man.

Question 12.
How does Nomita frighten Ajit?
Answer:
Nomita frightens Ajit by picking up a matchbox lying near and lighting a matchstick and touching it to her sari. The sari flares up.

Question 13.
What is the plight of Nomita in the family?
Answer:
Her plight is bad. He often fights with her husband Ajit. Her other sisters-in-laws tease her for spending too much time with her husband, instead of helping them in the household chores.

Question 14.
Comment on the expression ‘forest of people’. What does it tell us about the structure of Indian joint families?
Answer:
The author has used a very good metaphor in calling the joint family where Nomita and Ajit live as a forest of people. There are 26 members in that family. The writer has said Ajit gets the key to the letter box through the gaps among 52 hands! In a forest, some trees grow very tall but some get choked! There is no sufficient space for everyone to grow properly.

Think And Write

Question 1.
Sketch the character of Nomita. You may analyze the sentences given below:
Why, why does she keep on begging like this?
“Stop it! What a common, vulgar man you are!”
Nomita laughs a laugh that can bring an attractive flush to a white face.
Answer:
Nomita is the wife of Ajit. They live in a joint family. Altogether there are 26 members in that family. Nomita comes from a very poor family. But she is very beautiful and that is how she gets married into a rich family. Her mother, who is a widow, was the one who managed to find a rich boy for her daughter. Nomita has no brothers or sisters. She is referred to as ‘queen’ by her mother.

Her mother frequently writes to Nomita requesting her for money. She used to write in postcards which could be read by anyone. Nomita is ashamed that her mother is always begging for money. To prevent others from reading, Nomita asks her mother to write letters in an envelope. The requests are so frequent that Ajit says that there is no need for reading the letter, but send some money to her. Nomita also secretly helps her mother. It seems her mother is very demanding and shameless as she goes on begging.

One day while collecting the soiled clothes forgiving to the washer-man, Nomita sees a letter in the pocket of Ajit. It is torn and crumpled. It is addressed to her and from the postmark, it is obvious that Ajit got it some 3 days earlier. But he had not told anything about it. Nomita is unhappy because Ajit reads the letters addressed to her. She had told him many times not to do it. He says he is checking to see if any love letter is sent to her by somebody. At this point Nomita gets angry and tells him that he is a common, vulgar man. This enrages Ajit and he says she is a dung-picker’s daughter. He will do what he wants to do and what can she about it?

Nomita, flaming with anger, picks a matchbox and lights a stick and puts it on her sari which instantly catches fire. Ajit rushes and with his bare hands he puts out the fire telling her that she loses her common sense when she is angry. Nomita can be very sarcastic and can make faces effectively. She can easily tell lies as she calmly says her sari got burned as she was taking down a hot pot from the stove.

Nomita is good at making retorts. When her sister-in¬law accuses her of rushing to Ajit at every small opportunity, she asks herto come and peek into her room to see what is happening there. Nomita can forget things fast. Soon after the burning of the sari, she is ready to peel potatoes. Even while peeling potatoes she is thinking how she can help her mother by sending her some money.

Nomita seems to be a snob. She has forgotten that she came from a poor family. She calls Ajit a ‘common’ and vulgar man, forgetting that she is a common girl gifted with some beauty. People who forget their past are not good people. She seems to have forgotten her roots.

Question 2.
Do you think there is a set pattern for exhibiting a woman’s emotions? Is she always emotionally under stress? Justify your answer.
Answer:
I don’t think there is a set pattern for exhibiting a woman’s emotions. They express their emotions in different patterns. I don’t think she is always emotionally under stress. We wee how Nomita tries to burn herself one moment; the next moment we see her teasing her sister-in-law and soon we find her settling down to peel potatoes. She even tells lies about the burning of her sari.

Question 3.
Prepare a write-up discussing the space of women in a family.
Answer:
The women are the lamps of the family. It is impossible to imagine a family without a woman. Although we say the man is the lord of the family, in most homes things are decided by the women. They decide what to cook and what the members of the family should eat. They not only deliver children but look after them and bring them up in the right way. They do all the household chores. They also give a lot of love to their husbands and their children. Men are often rash but women are compassionate and generous. People are so attached to their mothers that often when facing troubles the word comes to their lips is ‘mother’. It is said that God created mothers because he could not be everywhere at the same time.

Question 4.
How does the author substantiate the comparison between a woman and a matchbox?
Answer:
The author compares women to matchboxes. Matchboxes contain enough gun powder to make a hundred Lankas burn. But they sit around meek and innocent in the kitchen, in the pantry, in the bedroom, in fact in any place. Women are the same. We see Nomita getting inflamed when Ajit insults her. She takes out the matchbox and lights a stick and puts it to her sari which catches fire. Fortunately Ajit is able to put the fire out. Soon she becomes a normal person and starts peeling potatoes. That is why the author says that even when they have material within themselves to burn many things, they never flare up to burn away the mask of men’s high-mindedness and their large¬heartedness. They don’t burn even their own colourful shells. The men know that. That is why they leave them scattered carelessly in the kitchen, in the pantry, in the bedroom, here, there and everywhere. Without fear, they also put them in their pockets.

Activity I: (Review)

Question 1.
It is often said that an empowered woman is the one who can ‘find her own voice’, ‘speak up’, and ‘be seen and heard’. In the present world, what we need is to foster a man-woman relationship which contributes to healthy, mutual development. Man and woman should move forward together, supporting and respecting each other, and being open to different opinions and situations.

How far is the above statement relevant to Nomita in Ashapurna Debi’s “Matchbox”? Prepare a review of the story, emphasizing the role of its women characters.
Answer:
The story is very simple. Nomita is married to Ajit. They live in a joint family. Nomita’s mother is a poor widow. Nomita has no brothers and so her mother always demands money from Nomita for her needs. She writes letters to her always telling misfortunes of various kinds with the intention of getting financial help from her son-in-law. Nomita is ashamed of the beggarly nature of her mother, but she continues helping her.

Ajit has the habit of opening and reading all the letters that are addressed to Nomita. Once she sees a crumpled letter addressed to her in one of his trousers’ pockets. The letter was written by her mother. He had received the letter some 3 days ago but he never told Nomita about it. Nomita had asked him many times not to open and read her letters. When she questions him about his bad habit, he says he will always do as he likes and what could she do stop him. There is a heated exchange and Nomita picks up a matchbox and sets fire to her sari. Ajit is able to put out the fire. All this drama takes place as the washer-man was waiting for the dirty clothes.

Soon Nomita gives the dirty clothes to the washer¬man and gets busy with household work. There is some teasing by a sister-in-law who accuses Nomita of spending too much time in the company of her husband, neglecting her duties in the joint family.

The two most important women characters in the story are Nomita and her mother. Nomita is a beautiful young girl who wants to assert her freedom but her husband Ajit does not allow it. He insists on reading the letters addressed to her. Nomita’s mother is a typical widow who wants to get as much help as

possible from her rich son-in-law. Her begging behaviour makes Nomita lose her face before her husband and other family members.

It is true that an empowered woman is the one who can ‘find her own voice’, ‘speak up’, and ‘be seen and heard’. We need gender equality and then only we can have a healthy world. Dominance by any sex will ruin the equilibrium of the family and the society.

Activity II (Panel Discussion)

Question 2.
Panel means a group of experts. A discussion held among these experts in front of an audience is a panel discussion. It helps to clarify the difficult aspects of a topic in a systematic and objective manner. There are three sets of participants in a panel discussion: Panellists, moderator and audience.

Now conduct a panel discussion on the topic ‘Indian women – finding a space in the socio cultural milieu’.

Points to be considered:

  • The effect of the media on a woman’s self-image.
  • Healthy women, healthy nation
  • The need for cultivating mental strength and mental toughness
  • The need for a productive and harmonious work environment
  • Acting as a mentor and guide to other women and girls
  • Other marginalized sections of the society
  • The pivotal role of women from the past to the present

Answer:
Panellists are experts in the field concerned. Decide upon the panellists (panel members) and list them.

Panelists  Designation
1. Dr. Ammini Jacob  Senior Lecturer
2. Dr. Ranbir Kaur  HOD
3. Dr. GeetaAgarwal Moderator: Simi Ibrahim  Vice Principal

Question 3.
Prepare the script of a speech welcoming the panellists and introducing them to the audience.
Answer:

Good morning,

It gives me immense pleasure to welcome you all to this panel discussion on “Indian women – finding a space in the socio cultural milieu”. We all know that everything is not rosy for the women in India. Although we got our freedom in 1947, the Indian women are still not free to live their lives the way they want. They have to face so many problems because of our male-dominated society. Our women too need freedom to live their lives the way they want.

The panellists in this discussion are Dr. Ammini Jacob, a Senior Lecturer in St. Joseph’s College Irinjalakuda, Dr. Ranbir Kaur, the HOD of English, at St. John’s College, Kochi, and Dr. Geeta Agarwal, the Vice Principal of Hamidia College, Mancheri. We are sure their discussion will throw light on some of the vexing problems that women face in our country. The moderator is Simi Ibrahim, the well- known activist for women rights.

Question 4.
After the panel presentation and discussion, the moderator synthesizes and summarizes the key points.
Prepare a script of a speech summarizing the panel discussion.
Answer:
Let’s review what we have discussed today. On the whole, it has turned out to be a fruitful venture. We saw how Indian women are not given their rightful places in the society. There are 1.2 billion Indians, nearly half of which are women. India had only one woman President and one woman PM so far. Look at our Parliament. How many women MPs are there? Look at the Kerala Government. How many women Ministers are there? Is it not shame that although we got our independence in 1947, ourwomen are still left behind when it comes to education, employment and leadership?

Dr. Ammini Jacob had some good suggestions regarding the effect of the media on a woman’s self-image. She showed that how healthy women make a healthy nation. Dr. Ranbir Kaur emphasized the need for cultivating mental strength and mental toughness in women. She spoke of the need for a productive and harmonious work environment for women. She said that educated women should act as mentors and guides to other women and girls. Dr. Geeta Agarwal was greatly concerned with the other marginalized sections of the society. She showed how women played a pivotal role in the past, quoting the examples of Rani Laxmi Bai and Sarojini Naidu. Women should come forward to take up leadership positions. She asked the women not to wait patiently for their rights but grab them.

I would like to thank the panellists for giving us great ideas. I also thank the audience for being so disciplined and well-behaved. I am sure they have benefited immensely from the discussion. Together, let’s make a better tomorrow!

Thank you all!

Activity III: (Blurb writing)

Question 5.
A blurb is a description of a book on its back cover. It is brief summary of the book designed for marketing. It does not have any uniform pattern.
Look at the sample blurb.
Plus Two English Textbook Answers Unit 1 Chapter 3 Matchbox (Story) 1
Now prepare a blurb of’Pratham Pratishruti’ making use of the hints given on page 25.
Answer:
Pratam Pratishruti is a novel about an uncommon woman, Satyavatie, who dared to breakthe so-called rules made to control the lives of the Bengali women in her days. The novel depicts the endless suffering and the liberation of women in Bengal. In fact it is the story of women everywhere in India.

Ashapurna Debi, the novelist, created a space of her own in the world of creative literature, and Gender Studies. She once said, “Slowly and steadily a completely new world was getting created within my mind. It was a world of comprehension, of feeling. It was a world with a never- ending flow of feelings.” Most of her writings marked a firm protest against the inequality and injustice rooted in gender discrimination.

Pratama Pratishruti inspires young minds to create an enlightened world free of segregation. It was published by Ananda Publishers, first in 1964. Other notable works of the writer are Subarnolata and Bakui Katha.

A good book blurb should have the following qualities:

  • An opening with a catchy statement.
  • It appeals to the interest of the readers.
  • It urges the reader to buy/read the book.
  • It gives some information about the author, publisher and year of publication.
  • It should be short and dramatic.
  • It describes in a simple direct language where the story begins, what the circumstances are, its socio-cultural relevance and its message.

IV. Read And Reflect

Question 1.
“Backward, turn backward, OTime, in your flight,

Question 2.
Make me a child again just for tonight.”

Question 3.
Remembering the good old childhood days often fills our mind with freshness and vigour and revitalizes us enough to go forward with confidence.

Matchbox Edumate Questions and Answers

Question 1
In the story’ Matchbox’, the rift between Nomita and Ajit occurred when Ajit hid her mother’s letter and read the content secretly. Nomita could notwin the quarrel and had to return to her normal routines without a second thought. If the same situation arises in the life of a modern couple, how would it affect their relationship? What would be the woman’s response to such an issue? Prepare an essay on ‘Modem Woman – her dreams, aspirations and role in society’.
Answer:
Modem Woman – her Dreams, Aspirations and Role in Society In the story ‘Matchbox’ by Ashapurna Debi, there is a rift between Nomita and Ajit. It was caused when Ajit read Nomita’s mother’s letter secretly. Nomita is angry and in the argument that ensues, Nomita goes to the extent of attempting to burn herself. Somehow the quarrel is patched up and Nomita returns to her normal duties.

Things would have been different if this happened to a modem woman. In the past women were considered the lamps of the family. Most of the time, they stayed at home and did the household chores and looked after the children. The men were the lords of the family. Important things were decided by the men and women had hardly any say in such matters. Girls married the men who were chosen by their fathers. But all this is past hjstory. Today’s woman is more assertive and she will not tolerate a husband like Ajit.

Modem women think they are equal to men and they have a role to play even outside their homes. In the modern world, women are educated and they also want to work and earn money. They don’t want to depend on the goodwill of their husbands to get certain things they want.

In the home, modern wives expect their husbands to share household chores. In the past the wives would be busy in the kitchen, but the husbands would be reading newspapers or listening to the news.

Now, the wives also want to read the newspapers and listen to the news. They also want to be entertained and taken out for meals outside and also an occasional trip to attractive places.

Modern women also want their share in politics. They are no more satisfied to be led by men. They think they too have the capacity for leadership. Women like Golda Meir (Israel), Mrs. Bandaranaike (Sri Lanka), Margaret Thatcher (England) and Indira Gandhi of India have shown that women can be even better leaders than men. Today we have Theresa May as the Prime Minister of the United Kingdom, Angela Merkel as the President of Germany. It was only because of some bad luck Hillary Clinton lost to Donald Trump in the USA. Otherwise we would have a woman at the helm of affairs in the richest and most powerful nation in the world.

Question 2.
Imagine that a debate was held in your class on the topic ‘Nuclear Family. An Ideal Place for Women Empowerment.’ The following points were presented by one group against the topic.
a) Nuclear family provides unlimited freedom to women.
b) Nuclear family is not safe for women.
c) Nuclear family makes women irresponsible.
d) In a nuclear family, woman tends to neglect her children. Write four points supporting the topic.
Answer:
a) In a nuclear family, a woman gets enough time to do the things she likes – to cook the things she likes, to read, to write, to paint, to watch movies of her choice, etc.
b) Nuclearfamily makeswomen highly responsible because she realizes that any lapse on her part can cause calamities.
c) In a nuclearfamily, the woman can give greater attention to her own children. But in an extended family, she has to think of all the children there.
d) In a nuclear family, the woman can notice how the family progresses with her hard work. She feels important there and she knows that the welfare of the family depends on her also.

Question 3.
A panel discussion is conducted in your school on the topic ‘Role of Media in Women Empowerment. You are asked to initiate the discussion. How would you introduce the topic? Draft an introductory speech. Hints: (media-wide publicity-reach millions of viewers- require careful handling of details-wrong messages conveyed by advertisements and serials – responsibility of media)
Answer:
Respected Teachers and my dear friends, Good Morning!
It gives me immense pleasure to welcome you all to this panel discussion on “Role of Media in Women Empowerment”. If women empowerment has to be a reality, the media, both print and electronic, have to play a big role in it. Media can give wide publicity as they reach the nook and corner of the country. The majority of homes in India have television and many homes get daily newspapers. So by using these media, women empowerment can be given the boost it needs.

When using the media for women empowerment the details must be handled carefully. Women empowerment does not mean that women are given the right to do what they like and say whatever they feel. Many people consider women empowerment means a woman’s ability to smoke publicly, to drink in open bars or wear the kind of clothes she likes. This is not the meaning of empowerment. Its aims are more serious and graceful where women can contribute to the welfare prosperity of their community and humanity at large.

We are often misguided by advertisements and serials. There is a tendency to show women’s bodies to sell anything – from salt to satellites! The concept is that men get hooked to the curvaceous bodies and comely faces of women. This should be stopped. Women should not be used as promoters of merchandise! Some of the serials are grossly immodest and present women in bad light. Women should be bold and courageous but not unnecessarily aggressive and bloodthirsty, consumed by vengeance.

Media have a big and positive role to play in Women Empowerment in India.

We shall now listen to various views by our panellists.

Have a nice and fruitful day!

Question 4.
Given below is the blurb of a famous book. There are a few errors in it. Edit the passage.
Hints: (subject-verb concond-spelling-punctuation) 1984
The year.1984 has come and gone, but George Orwell’s prophetic, nightmarish vision in 1949 of the world we was becoming is timelier than ever. 1984 is still the great modern classic of ‘negative utopia’ – a startlingly orginal and haunting novel that create an imaginary world that is completely convincing, from the first sentence to the last four words. No one can deny that novels hold the imagination of whole generations.
Answer:
Wrong – Right
george oiwell’s – George Orwell’s
was – were
orginal – originals
create – creates

Question 5.
Read the following excerpts from ‘Matchbox’ and ‘Horegallu’.
‘I can’t? I can’t do anything? You want to see if I can do anything?’, says Nomita ‘God has given me two ears to listen to others. I hear them out with sympathy and without any judgement’, says Ratna. What do you understand about the character of Nomita and Ratna? Compare and contrast the characters of Nomita and Ratna.
Answer:
From the talk of Nomita one can easily guess that she is a hot-tempered woman. Here she is challenging her husband saying that if he thinks she can’t do certain things, he is mistaken. She can do some things which he thinks she can’t. She is challenging him and telling him whether he is prepared to see what she is capable of doing. It is by talking like this, she puts a burning match stick to her sari which catches fire. The conversation shows Nomita is not a dependable woman and she can act quite rashly in an unthinking manner.

But Ratna is quite a different woman. She is a middle- aged senior clerk and she is always smiling. Every day after lunch she sits with some person and listens to her/him. She is listening to people’s problems. Even by listening to them, she can help them. A big problem the modem world faces is that people have no time to listen to the problems of others! God has given us two ears to listen. A person with a problem feels relieved even when somebody sympathetically listens to him or her. Between the two women, Ratna is by far the better one.

Question 6.
A person can react against injustice in different ways. Nomita reacted by quarrelling with her husband and setting fire to the anchol of her sari. Whaf are the other possible ways in which Nomita could have reacted against her husband’s dirty habit? Suggest three other possible methods of response that could have been adopted by Nomita.
Answer:
People can react in different ways when they face problems. Nomita reacted by quarrelling with her husband and even setting fire to her sari. She could have used some other ways to show her displeasure and to mend the ways of her husband.

Tell him how impolite and rude the habit of reading letters addressed to others is. Reading letters addressed to othei^ is uncivilized behaviour.

She could have explained to him the helpless condition of her mother and the need to help her without complaining.

She could have stopped talking to him for some time so that he can realize that she is offended and this might help him in changing his bad habit.

Question 7
Imagine that Nomita’s mother visits Ajit’s household a few days after the quarrel between Nomita and Ajit. Nomita narrates the entire incident to her mother. She tries to console her daughter and promises that she won’t write letters to her. What would be the conversation between the mother and daughter? Draft the conversation.
Answer:
Nomita’s
Mother : I’m sorry Nomita that this happened because of my letter. How was I to know that he opens your letters?
Nomita : At least now you know. So please do not write such letters again.
Mother : What shall I do then? There is nobody to help me.
Nomita : If you need money so badly, phone me. This is my number.
Mother : From now on, I will do that. I know it is hard on you to help your mother as you do not earn any money. But you must consider my helplessness.
Nomita : It’s okay, Mom. I will do what I can. But call me only when you are in real need of money. You know it is not easy to get money from Ajit. When I get the call from you I shall find some way of sending you help.
Mother : Thank you, Nomita! You are a sweet girl. Glad that you have not forgotten your poor mother!
Nomita : It is okay, Mom.

Question 8
Read the following passage and answer the questions given below:
Nomita speaks her mind so no one attacks her outright to her face; they only pinch her with sharp words.
a) What is the meaning of the expression ‘pinch with sharp words’?
(a. make someone happy, b. make someone angry, c. irritate, d. speak rudely and cause pain)
b) What quality of Nomita is evident here?
c) Who does’ they’ refer to?
d) What is the plight of Nomita in the family?
Answer:
a) speak rudely and cause pain
b) Nomita speaks frankly without caring how others take it. Others are afraid of her because she can speak her mind openly. >
c) The word ‘They’ refers to the members of Ajit’s family.
d) She is not much liked by the other sisters-in-law. They are fond of laughing at her. They are united against Nomita and Nomita has to fight alone.

Question 9.
Nomita is angry with Ajit for reading the letter sent by her mother. She found the letter in Ajit’s pocket. What could have been the contents of the letter? Attempt it.
Answer:
Vaishno Devi
13/IVM.G. Road
Calcutta
6 June 2015

Dearest daughter,
It’s been quite a long time since I heard anything from you. How are you there? How is Ajit? How are the other members of the family?

I can’t say I am quite fine. Since Last week I have been suffering from some cough and cold. I tried some local medicines, but the cough is persisting. Our neighbours told me I must visit the doctor. But the fact is I have no money to pay the doctor’s fee or to buy the medicine. My clothes have become very old and I need a new sari also. So I have to ask you to send me some money. I know I am bothering you. But what can I do?

Your immediate response will help me.
Yours lovingly,

Sd/-
Vaishno Devi

Question 10.
Nomita is a housewife. Is she an empowered woman? Write your opinion in a paragraph of about 100 words.
Answer:
Nomita is not an empowered woman. For every little thing she has to ask her husband. She has no money of her own and therefore she has to beg her husband to send some money to her mother. Nomita is not empowered in the sense that she does not think rationally. How can she set fire to her sari just because her husband Ajit did not give her the letter addressed to her? An empowered person would be able to take rational decisions. Nomita can talk cheaply. When her sister-in-law accuses her of rushing to Ajit at every small opportunity, she asks her to come and peek into her room to see what is happening there, ‘fhis is a cheap retort. Nomita is a snob. She has forgotten that she came from a poor family. She calls Ajit a common and vulgar man forgetting that she comes a very poor family and she is vulgar herself. She had forgotten her roots. An empowered woman will not forget her roots.

Question 11
Ajit’s elder brother notices the rift between Ajit and Nomita. He makes the couple meet a counselor. If you were the counselor what advice would you give Ajit? Write three pieces of advice, using expressions like ‘You should … , You ought to … , You had better…………..
Answer:
You should not read the letters addressed to others unless they permit you to do so.

You ought to show more respect to your wife Nomita and give her all the letters addressed to her without opening them.

You had better take a resolution not to open Nomita’s letters. If she wants you to read them, she will give them to you after she reads them. Letters are private affairs and no one has a right to read the letters addressed to others.

Question 12.
Nomita after gaining control of her anger speaks to Ajit about his insulting behaviour. Edit the errors in the dialogue given below.
Nomita : Ajit, you hurted me today. Why do you read my mother’s letters? Do you know how much she loves we? She is proud for her son-in-law. Still you don’t like her.
Ajit : Nomita, I didn’t do it deliberately. I’m sorry.
Answer:
Wrong – Right
hurted hurt
we – us
for – of
delibaretely – deliberately

Question 13.
Imagine that Ajit feels guilty over his brashness towards Nomita. He requests Nomita to forgive him. How will he ask for forgiveness? Write three sentences. You may use the following expressions like ‘Please forgive…., I regret , I am extremely
Answer:
a) Please forgive my fault of reading your letters.
b) I regret that I called you a dung-picker’s daughter.
c) I am extremely sorry for speaking rudely to you.

Question 14.
‘Nomita keeps thinking about how she might be able secretly to send her mother a few rupees’.
Imagine that Nomita stealthily geos to a post office to send a money order to her mother. She seeks the help of the postmaster to send the money order. How will she ask for help? Draft two request statements for her.
Begin the answer like this:
Sir, Would you please help me……………
Answer:
Sir, would you please help me to send Rs. 50/- to my mother? Here is the money. Her address is Vaishno Debi, 13/IVM.G. Road, Calcutta.
Sir, I want to send Rs. 50/- to my mother by money order. Please help me. Her address is Vaishno Debi, 13/IVM.G. Road, Calcutta.

Question 15.
Read the following conversation between Nomita and Ajit.
He said “What letter? Mndeed, there was a letter from your mother. I just hadn’t got around to giving it to you
“Why hadn’t you got around to it?
“What a nuisance! Ajit said,Td forgotten -why else? Imagine that Rini, Ajit’s niece overhears the conversation and reports it to her mother. Draft the report for Rini.
Answer:
Ajit at first pretended that he didn’t understand her and later agreed that there had been a letter from her mother and that he hadn’t got around to giving it to her.

She asked him why he hadn’t got around to it.

Ajit exclaimed saying that she was becoming a nuisance and he had just forgotten to give her the letter.

Question 16.
Given below are a few newspaper headlines on ‘Domestic Violence’ displayed in a classroom. The teacher asks the students to respond to these headlines. A student writes a note of protest against increasing violence towards women.

Woman hangs self, father alleges in-laws demanded dwry.
Meerut man pours acid on wife, in-laws.
Man kills 8 month old daughter, in a fit of rage surrenders to police
Brother attacks sleeping sister, gouges her eyes.
She/He starts the note like this.
I am really shocked by these newspaper headlines.

I can’t believe that I am living in the twenty first century. These headlines ……………………………………………
……………………………………………
…………………………………………… Complete the note for her/him.
Answer:
l am really shocked by these newspaper headlines. I can’t believe that I am living in the 21st century. These headlines show how terrible the life of a woman is in India. In the first case a woman hangs herself because she was not able to give adequate dowry to her husband and his family. She was grossly mistreated in the husband’s home and she could not take it any longer. In the second case, a cruel man pours acid on his wife and the in-laws. In the third case a man kills his 8-month old daughter in a fit of rage. In India girls are considered a burden on the family. There used to be female infanticides. Now we have female foeticides. By ultrasound scanning the sex of the foetus is determined and if it is a female, abortion is done. The last one is horrible. Imagine a brother attacking her sleeping sister and gouging her eyes. Where is brotherly love? Atrocities against women are rampant in our society. We speak of equality of women with men. That equality is only on paper. Women are discriminated against socially, economically and culturally. One really wonders if one is living in the 2151 century! When indeed when, will these atrocities end!

Matchbox About The Author

Plus Two English Textbook Answers Unit 1 Chapter 3 Matchbox (Story) 2
– Ashapurna Debi

Ashapurna Debi (1909-1995) is a prominent Bengali novelist and poet. She has received many awards including Jnanpith and Padma Shri.

Matchbox Summary in English

Page 1: I always compare women to matchboxes. Matchboxes contain enough gun powder to make a hundred Lankas burn. But they sit around meek and innocent in the kitchen, in the pantry, in the bedroom, in fact in any place. Women are the same. Here is an example.

Look at that enormous 3-story house in front. It is Sunday morning. The washer-man has come to collect the soiled clothes. Nomita is the wife and Ajit is the husband. Before handing over Ajit’s dirty clothes, Nomita checks his pockets. She discovers a letter. It was a twisted, crumpled and torn envelope with Nomita’s name on it. Suddenly Nomita is tensed up. She drops the clothes and sits on the bed to read the letter. It had come at least 3 days earlier, as is evident from the postmark.

Ajit had opened and read it. Then he crumpled and twisted it and dropped’if into his pocket. He did not even think it necessary to speak about it to Nomita. She is angry. This is not a casual oversight, but a deliberate action on Ajit’s part.

Page 18: Ajit’s nature is like that. Ajit and Nomita live in a joint family. There are 26 people there. Ajit somehow got the key to the letter box. Whenever he finds a letter addressed to Nomita, he opens it and reads it first. Sometimes he gives the letter to her but sometimes he does not. That is what Nomita thinks. So far Ajit has not discovered any letter that is even slightly suspicious. But his ugly habit will not go. She tried many things to make him stop reading her letter. She showed anger, took offense, tried to shame him and used sarcasm. Nothing worked. He just laughs it away. Sometimes he scolds her.

Nomita now reads the letter. It is from her mother. She goes on complaining about things – the ceiling of her room is cracked and the rainwater falls in. If this is not remedied she may die as the roof comes crashing down. She does not mind death. Her daughter is a queen and her son-in-law is high minded and large-hearted, etc. etc.

Nomita’s mother is a widow. She has no son. She was successful in getting Nomita married into a wealthy family because of Nomita’s looks. The old lady always boasts of her achievement. She always requests for help from Nomita. Whenever Ajit sees a new letter he knows it is for requesting money and so he says, “Why read the letter? I’ll go and fill out a money-order form.”

Nomita feels ashamed. Out of anger and grief, Nomita wrote to her mother not to write on postcards because then everybody would read it. She would send her some money in secret whenever she could manage.

Suddenly Nomita gets angry at her mother. Why does she go on begging like this? Why doesn’t she allow Nomita to keep her self-respect and dignity? She decides to write a letter to her mother telling her that she won’t help her any more:

Ajit comes into the room after having his leisurely Sunday bath. Nomita, terribly angry, asks him when the letter had come. Ajit knows he has made a mistake. He had planned to send some money to Nomita’s mother and throw away the letter. He made a mistake in leaving it in his pocket. As though trying to remember hard, Ajit asks, “Letter? What letter?” Then as if remembering suddenly he says that he was planning to give it to her. But he had forgotten.

Nomita calls him a liar and hisses like a snake. She wanted to know why he had opened her letter. Ajit says he has a right to open his wife’s letter. She says she had repeatedly told him not to open her letters. Ajit tries to laugh the matter away. Jokingly he says, “Shouldn’t I make sure that no one is passing you love letters in secret?”

Nomita explodes in anger. “Stop it! What a common, vulgar man you are!” Ajit can’t continue with his fake smile. He too is enraged.

Page 20: He asks her how could her mother go on begging for money from him and still think they are high-class people. How can a dung-picker’s daughter be a queen? Nomita asks him to shut up. She spoke so loudly that everybody nearby would hear her if she was speaking from the ground floor. But they were on the 3rd floor. Ajit says he won’t shut up and will do what he wants. What can she do about it? She says she can do something. She now does something quite astonishing. She picks up a matchbox lying near and lights a matchstick and touches it to her sari. The sari flares up. Asking if she has gone mad, Ajit comes rushing and puts out the fire using his hands. Now he is a little afraid. He looks at her and he sees fire burning, blazing on her face. He can’t easily put out that fire. He tells her that she loses all common sense when she is angry. How could a woman be so angry!

Nomita was about to say something. But her niece Rini steps into the room. Rini asks her how long the washer-man should wait. If Nomita does not want to give him any clothes, tell him. Fora moment Nomita does not say anything. Then she picks up the dirty clothes and sorts them. She asks Rini to go down and tell the washer¬man to wait for her.

Nomita speaks her mind. No one attacks her outright. But they pinch her with sharp words. Her second sister- in-law is tired with work this morning. When she sees Nomita, she puts a twisted smile and says sarcastically that.it was good that finally she decided to come down. She accuses her of always running to Ajit for her comfort whether there is work at home or not. She asks her if their love-talk will never end.

Nomita looks around. She sees many there. She does not want her voice to tremble. She also puts on a smile and tells the sister-in-law to come to their room and peek. It is not always love-talk, there is also angry talk.

The sister-in-law laughs and says that she should not try to pretend that they are not always talking love. She says she is not foolish. There is no need to peek. Even without peeking, they all know what is happening in the room. Nomita laughs at her and says she is fond of saying naughty things.

The eldest sister-in-law suddenly comes running and asks if she has finished cutting the vegetables. She asks them if they are spending time chitchatting. Suddenly she notices the burned sari of Nomita and asks her how it happened. Nomita is silent for a moment. Then she says she used that part of the sari to lift a hot pot from the stove and that is how it got burned.

Nomita starts peeling potatoes. Secretly she is thinking how she could send some money to her mother. She can’t write and tell her mother that she can’t do anything. The entire village knows Nomita is a queen, and Ajit is large-hearted.

This is why I compare women with matchboxes. Even when they have material within themselves to burn many things, they never flare up to burn away the mask of men’s high-mindedness and their large-heartedness. They don’t burn even their own colourful shells. The men know that. That is why they leave them scattered carelessly in the kitchen, in the pantry, in the bedroom, here, there and everywhere. Without fear, they also put them in their pockets.

Matchbox Summary in Malayalam


Matchbox
 Glossary


Plus Two Botany Chapter Wise Previous Questions Chapter 5 Biotechnology and its Applications

Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 5 Biotechnology and its Applications.

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 5 Biotechnology and its Applications

Question 1.
Teacher asked Balan to write the principle of RNAi technology. Help him by describing the method.(MARCH-2010)
Answer:
The silencing of mRNA by a double stranded RNA (dsRNA) is called RNA interference.

Question 2.
Bt. Cotton is a well known example of application of Biotechnology in Agriculture. Bt. Cotton reduces use of pesticides. Explain. (MAY-2010)
Answer:
Bt. Cotton is a transgenic plant which contains the cry gene of bacillus thuringiensis. The cry gene produces cry protein which kills larvae of lepedopteran, diptern insects which attack cotton plants. This protein is inactive in bacteria and becomes active in the intestine of insects. When the cry gene is transferred to the plant it becomes resistant to the insects.

Question 3.
Adenosine deaminase (ADA) deficiency is a hereditary disease, where ADA, which is crucial for functioning of immune system is absent. Explain how ADA deficiency can be treated. (MAY-2010)
Answer:
Lymphocytes are taken from patient’s blood. It is grown invitro culture. By using retroviral vector functional ADA c DNA (from WBC of normal person) is introduced into invitro cultured lymphocytes of patients. These genetically engineered lymphocytes (corrected functional lymphocytes) are re injected to patients. If the ADA producing genes are introduce into cells at early embryonic stage it could be a permanent cure.

Question 4.
Bt toxin is produced by Bacillus thurungiensis that can kill certain insects. (MARCH-2011)
a) Name the bacterical gene that is producing this toxin.
b) Why the toxin produced by the bacterium is nontoxic to it?
Answer:
a) Cry-gene
b) Bt. toxin protein exist as inactive ie. protoxin in bacteria

Question 5.
Raju is a diabetic parient who takes insulin injections regulary. The insulin used by such patients is producted by genetically engineered organisms . Write the different steps involved in the production of insulin by genetic engineering. (MARCH-2011)
Answer:
1) Preparation of DNA sequences corresponding to A&B chain of human insulin.
2) Introduce them in plasmid of E.coli.
3) Products of A&B Chains are separated.
4) Combine A&B chains by creating disulphide bonds

Question 6.
Expand the common short forms used in biotechnology. (MAY-2011)
i) GEAC
ii) GMO
iii) PCR
iv) ELISA
OR
Bt toxins are not toxic to bacillus and Bt cotton plant but toxic to insects. Explain.
Answer:
i) GEAC – Genetic Engineering Approval Committee
ii) GMO – Genetically Modified Organisms
iii) PCR -Polymerase Chain reaction
iv) ELISA – Enzyme Linked Immuno Sorbent Assay
OR
The protein crystals are solubilised in the presence of alkaline pH of insect gut, hence becomes toxic to insects.

Question 7.
In human beings, certain diseases are caused due to genetic disorders. (MARCH-2012)
a) Name the method that allows the correction of a gene defect that has been diagnosed in a child or embryo.
b) How this method has been used for treating ADA (Adenosine deaminase) deficiency?
Answer:
a) Gene therapy
b) Introduction of functionalADAcDNAintothe lymphocyte of defective person.

Question 8.
Infection by nematodes cause threat to cultivation and yield loss of tobacco plants. A strategy has been developed at RNA level to control this infestation. (MARCH-2012)
a) Name the process.
b) Explain how this process works at the molecular level.
Answer:
a) RNA interference
b) In this process specific mRNA of the nematode is silenced due to a complementary ds RNA, that prevents the translation of mRNA

Question 9.
Using genetically modified crops, farmers can minimize use of insecticides and pesticides during cultivation. (MAY-2012)
a) Give name of one such genetically modified pest resistant crop.
b) Which gene is used for its production?
c) Name the source of pest resistant gene.
d) Write about its mode of action.
Answer:
a) Bt cotton
b) cry gene
c) Bacillus thuringiencis
d) The cry gene produce the insecticidal protein which solubilised in the alkaline PH of insect gut and make pores in the epithelial cells.This causes the death of insect.

Question 10.
Nita found that her Grandma used to inject human insulin that is genetically engineered. She wants to know how such insulin can be produced. Give her an idea about structure of insulin and production of genetically engineered insulin. (MAY-2012)
Answer:
It consists of two short polypeptide chains: chain A and chain B, that are linked together by disulphide bridges.
It is necessary to prepare two DNA sequences corresponding to A and B, chains of human insulin and inserted in plasmids of E. coli to produce insulin chains. Chains A and B are produced separately, extracted and combined by creating disulfide bonds to form human insulin.

Question 11.
A novel strategy to prevent nematode infestation is (MARCH-2013)
based on ‘RNA interference’
a) Explain RNA interference.
b) Can you suggest, how it can be used for producing nematode resistant plant.
Answer:
a) it involves silencing of a specific mRNA of nematode Here the complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing).
b) Afterthe insertion of nematode-specific genes by Agrobacterium vectors into the host plant, it produce both sense and anti-sense RNA in the host cells. These double stranded RNA (dsRNA) that initiated RNAi and silenced the specific mRNA of the nematode.

Question 12.
Sophie was born with a genetic disorder – ADA deficiency. (MARCH-2013)
a) What is ADA deficiency?
b) Can you suggest methods to treat this ADA deficiency?
Answer:
a) Adenosine deaminase (ADA) deficiency
b) Bone marrow transplantation or gene therapy (Lymphocytes from the blood of the patient are cultured and functional ADA cDNA is introduced in it.Then, these cells are return back to the patient) .

Question 13.
Gene therapy aims in correcting diseases caused by defective genes. A Child is suffering from a disease due to deficiency of ADA enzyme. ADA gene which normally produce the enzyme is missing in the patient. Recommend any two methods to treat the child. (MAY-2013)
Answer:
Enzyme replacement therapy & Genetic engineering.

Question 14.
Expand the short forms used in Biotechnology. (MAY-2013)
1) PCR
2) ELISA
3) GEAC
4) GMO
Answer:
PCR – Polymerase Chain reaction
ELISA – Enzyme Linked Immuno Sorbent Assay GEAC – Genetic Engineering Approval Committee GMO – Genetically Modified Organisms

Question 15.
Bt Cotton is regarded as an important achievement of genetic engineering. What does Bt stands for? (MARCH-2014)
Answer:
Bacillus thuringiensis

Question 16.
Animals that had their DNA manipulated to possess and express foreign DNA are called transgenic animals. Write briefly any three benefits of such transgenic animals to human beings. (MARCH-2014)
Answer:
a) Transgenic mice are used to test the safety of the polio vaccine.
b) Transgenic cow, Rosie, produced human protein enriched milk (2.4 grams per litre).The milk contained the human alpha-lactalbumin It is the balanced product for human babies than natural cow- milk.
c) Transgenic animals that carry genes which make them more sensitive to toxic substances than non- transgenic animals. Toxicity testing in such animals get results in less time.

Question 17.
Consider you are appointed as biotechnologist in a National Institute: What are the basic steps to be designed to produce a genetically modified organism? (Hint 3 points) (MAY-2014)
Answer:
i) Identification of DNA with desirable genes.
ii) Introduction of the identified DNA into the host.
iii) Maintenance of introduced DNA in the host and transfer of the DNA to its progeny.

Question 18.
Pharmaceutical companies are producing large quantities of human insulin by genetic engineering. Briefly explain the process. (MAY-2014)
Answer:
1. Prepare two DNA sequences corresponding to A and B, chains of human insulin.
2. Introduced them in plasmids of E. coli to produce insulin chains.
3. Chains A and B were produced separately, extracted and combined by creating disulfide bonds to form human insulin.

Question 19.
in the 2012 children’s science congress one of the speaker summarized like this – if we are not vigilant, countries or individuals encash our resources as their right. (MAY-2014)
Explain this with an example
Answer:
Basmati rice is distinct for its aroma and flavour and 27 documented varieties of Basmati are grown in India. There is reference to Basmati in ancient texts, folklore and poetry, as it has been grown for centuries.
In 1997, an American company got patent rights on Basmati rice through the US Patent and Trademark Office. This allowed the company to sell a ‘new’ variety of Basmati, in the US and abroad.

Question 20.
In a class room seminar on cloning vectors, your friend asked to explain the steps to introduce the plasmid DNA to a bacteria cell, Microinjection and bilestics. Answer his questions. (MAY-2014)
Answer:
For this, bacterial cells must first be made ‘competent’ to take up DNA. This is done by treating them with a specific concentration of a divalent cation, such as calcium, Recombinant DNA can then be forced into such cells by incubating the cells with recombinant DNA on ice, followed by placing them briefly at 42°C (heat shock), and then putting them back on ice. This helps to introduce the plasmid DNA into bacterial cell.
Microinjection – In this recombinant DNA is directly injected into the nucleus of an animal cell. Biolistics – In this cells are bombarded with high velocity micro-particles of gold or tungsten coated with DNA

Question 21.
Genetically Modified Organism (GMO) is always a debatable topic among scientists,’academicians and public. State any four usefulness of GMOs. (MARCH-2015)
Answer:
i) More tolerant to abiotic stresses (cold, drought, salt, heat).
ii) Reduced reliance on chemical pesticides (pest- resistant crops).
iii) Helped to reduce post harvest losses.
iv) Increased efficiency of mineral usage by plants
v) Enhanced nutritional value of food, e.g., Vitamin ‘A’enriched rice.

Question 22.
Biotechnology in agriculture will lead to pest resistant plants, which could decrease the amount of pesticides used. For example Bt cotton. Expand the letter ‘B’ and ‘t’. (MARCH-2015)
Answer:
B-Bacillus t-thuringiensis

Question 23.
In 1997, an American company got patent rights on Basmati rice through the U.S. Patent and Trademark Office. Variety of Basmati had actually been derived from Indian farmer’s varieties. If so, what is Biopiracy? (MARCH-2015)
Answer:
It is the use of bio-resources by multinational companies and other organisations without proper authorisation from the countries and people concerned without compensatory payment.

Question 24.
One of the speaker in the National Children’s Science Congress delivered a talk about Transgenic animals. Explore any 2 benefits of Transgenic animals. (MAY-2015)
Answer:
i) Study of disease: Transgenic animals can be used to know, how genes contribute to the development of disease.
ii) Biological products: Transgenic animals that produce useful biological products. In 1997, the first transgenic cow, Rosie, produced human protein-enriched milk contained the human alpha- lactalbumin. It is nutritionally a more balanced product for human babies than natural cow-milk.

Question 25.
The recombinant DNA technological process have made immense impact in the area of healthcare. How Eli Lilly produced Insulin? (MARCH-2016)
Answer:
Eli lily prepared two DNA sequences corresponding to A and B chains by using recombinant DNA technology , it is introduced into plasmid of E coli and produced polypeptide chains A and B.
These chains are separated and connected by using disulphide linkage to form human insulin

Question 26.
A farmer approached an Agriculture officer to tell his grievance i.e.. reduction in tobacco yield due to root damage by nematodes, (MARCH-2016)
a) What is your suggestion to prevent this infestation?
b) Briefly explain the process.
Answer:
a) RNA interference (RNAi)
b) The best method used to prevent the attack of nematode is RNA interference (RNAi). It involves silencing of a specific mRNA of nematode. Here the complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing).

Question 27.
RNA can suppress the activity of a gene. Explain it with suitable example. (MAY-2016)
Answer:
In this process nematode specific genes were introduced into the host plant through agrobacterium,it produce both sense and antisense RNA, since this two RNAs are complementary to each other, form a dsRNA RNAi is operated and the nematode can’t produce proteins.

Question 28.
Match the following: (MARCH-2017)
Plus Two Botany Chapter Wise Previous Questions Chapter 5 Biotechnology and its Applications 1

Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 5 Biotechnology and its Applications 2

Question 29.
Insulin getting assembled into a mature form was the major challenge in commercial insulin production by rDNA technology. How did Eli Nilly found a solution to this problem? (MARCH-2017)
Answer:
An American company Eli Lilly in 1983 prepared two DNA sequences corresponding to A and B, chains of human insulin and inserted in plasmids of E, coli to produce insulin chains. Chains A and B were produced separately, extracted and combined by creating disulfide bonds to form human insulin.

Question 30.
A) Bt cotton is an example of genetically engineered cotton. (MAY-2017)
a) What does Bt stands for?
b) Name the gene responsible for Bt toxin production.
c) How does the toxin kill the insect?
OR
B) Gene therapy is a corrective therapy for a hereditary disease.
a) Name the disease which was successfully corrected by gene therapy for the first time.
b) How gene therapy is practiced for a permanent cure of the disease?
Answer:
A) a) Bacillus thuringiensis
b) Cry gene
c) Bt toxin protein exist as inactive protoxins it is converted into an active form in the presence of the alkaline pH of insect gut. The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and results in the death of insect.
OR
B) a) Adenosine deaminase deficiency (ADA)
b) In this, functional ADA cDNA is introduced into embryonic stage. It is permanent cure forthe disease.

Question 31.
Antigen-antibody reaction is the basis of the technique called ____. (MAY-2017)
a) ELISA
b) PCR
c) RNA interference
d) Gene therapy
Answer:
ELISA

Glimpses of Greatness Questions and Answers Plus One English Unit 1

Kerala State Board New Syllabus Plus One English Textbook Answers Unit 1 Glimpses of Greatness Text Book Questions and Answers, Summary, Notes.

Kerala Plus One English Textbook Glimpses of Greatness Questions and Answers Unit 1

Let’s begin

Question 1.
“Some are born great; some achieve greatness; some have greatness thrust upon them. ”-William Shakespeare (Twelfth Night).
Is greatness an innate trait? Is it acquired by the successful or thrust upon them? Discuss.
Answer:
I don’t think greatness is an innate trait. It is acquired by successful people. Look at the examples of Abraham Lincoln, Mahatma Gandhi, Nelson Mandela, Mother Theresa and Dr. APJ Abdul Kalam. They all acquired their success by hard work, perseverance, courage and determination. Success is not thrust upon them. They worked for it and they got it.

Question 2.
What qualities make people great? Discuss with your friends and write them in the boxes below:
Plus One English Textbook Answers Unit 1 Glimpses of Greatness 1

Question 3.
We strive to reach heights, achieve greatness and be successful ¡n life. But at times, it seems difficult. Now, look at the picture below:
Plus One English Textbook Answers Unit 1 Glimpses of Greatness 2
What thoughts and feelings does it evoke in you?
Answer:
The boy has stage-fright and he is not confident to perform before the judges and the audience. He is trying to get away but he is being forced by his teacher to say something or sing.

Question 4.
Give a suitable caption to the picture.
Answer:
“The Reluctant Performer”.

Question 5.
Have you had any similar experience? If so, share it with your friends.
Answer:
Yes, J had. I was in the 10th Standard and I was asked to make a Welcome Speech on the School Day. I was not keen on doing it. But my Principal insisted that I should do it. I prepared a speech and studied it by heart. When I got on the stage on the School Day, I started shivering and shaking and my mind went blank. I could not say a word. The Principal had to prompt me to speak some words. I somehow stammered something and fled from the stage. It was the worst day of my life as my classmates teased me about my ‘Speech’.

Think And Respond

Question 1.
What made little Abe stand on the dry goods box and deliver the speech?
Answer:
Little Abe stood on the dry goods box and delivered the speech because he was replying to a stump speaker, who made the speech standing on the stump of a tree.

Question 2.
Do you think good dress, appearance, position in society, etc., are needed to present yourself before the public for a speech?
Answer:
I think in normal circumstances good dress, appearance, position in society, etc., are needed to present ourselves before the public for a speech. But in the case of some famous people like Abraham Lincoln and Mahatma Gandhi, good dress, appearance, etc., did not seem to matter. But these are exceptions and not the rule.

Question 3.
What is the role of Dennis in bringing out the best in young Abe?
Answer:
Dennis was like a catalyst in bringing out the best in young Abe. Dennis recognised the capabilities of Abe and encouraged him to show them to the public. Dennis was a good friend of Abe and he wanted Abe to shine.

Question 4.
Do you think that everybody has some potential in them? Some people take the initiative, while others do not dare to showcase their talents. What do you think are the reasons for this? Write down your views.
Answer:
I think that everybody has some potential in them. Some people do not dare to showcase their talents because of many reasons:

  • Lack of opportunity
  • Lack of confidence
  • Lack of encouragement
  • Fear of failure

I. Read and Reflect

Question 1.
We are going to read the story of a young seagull. He was afraid to make his first flight. His parents helped him into action and thus made him ready to face the challenges of life.

Glimpses Of Greatness About This Unit

“Success is not final, failure is not fatal: it is the courage to continue that counts.” Sir Winston Churchill.

Success is surely the fruit of perseverance. The great achievement of others can inspire us. Similarly, we can be an inspiration to many others. This Unit highlights the personality traits of some great people. It emphasises the qualities that are to be developed to become successful in life.

This Unit has the following:
a) An anecdote from the life of Abraham Lincoln – ‘Abe’s First Speech’.
b) A Story by Liam O’Flaherty – ‘His First Flight’.
c) A Speech by Dr. APJ Abdul Kalam – 7 will Fly’.
d) A Short Biographical Sketch of Stephen Hawking – ‘Quest for a Theory of Everything’.
e) A Poem by Rudyard Kipling – ‘If’.

The Unit aims at equipping the students to face the challenges of life with courage, confidence and perseverance and to become unique in their own ways, upholding the values of life. The Unit also aims at building confidence in the students to use English effectively in different situations of their lives.

Glimpses Of Greatness About This Author

Abraham Lincoln (Abe) is one of the greatest American statesmen. He is known for his famous speeches. Here is the story of his first speech as a small boy.

Abe’S First Speech

Abe made his first speech when he was a boy. He was without shoes. One suspender held up his trousers. He wore a cheap straw hat. Through a hole in it, some of his hair stuck out.

Abe attended a political meeting with his friend Dennis Hanks. Dennis was Abe’s companion in splitting logs to make rail fences. The meeting was addressed by one stump speaker. Stump speakers were those trained political speakers who addressed the audience standing upon tree stumps. The speaker was shouting at the top of his voice and he was making wild signs with his hands.

Plus One English Textbook Answers Unit 1 Glimpses of Greatness 3

At the end of the speech, Abe and Dennis did not agree with the views of the speaker. Dennis thought Abe could make a better speech than what the speaker had made. He got a dry goods box and asked Abe to reply to the earlier speaker.

Abe threw his straw hat to the ground. He got on to the dry goods box and delivered a speech. The crowd listened to the speech attentively and applauded him. Even the first speaker admitted that Abe’s was a fine speech and it answered every point in the speech made by him.

Dennis Hanks was very happy. He thought that Abe was the greatest man that ever lived. He went on saying how Abe was a better speaker than the trained campaign speaker.

(From ‘Abe Lincoln’s Anecdotes and Stories’ by R.D. Wordsworth)

Glimpses Of Greatness Glossary

Plus One English Textbook Answers Unit 1 Glimpses of Greatness 4

Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology: Principles and Processes

Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 4 Biotechnology: Principles and Processes.

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology: Principles and Processes

Question 1.
Rinku with a circular DNA contains sequence (MARCH-2010)
5′-> GGAATTCC -> 3′
3′ -> CCTTAAGG -> 5′
She wishes to add a new segment of DNA into it.
a) Identify the technology she planned.
b) Suggest the specific enzyme to make a cut in the DNA with above sequence.
c) Name the category of enzyme you suggested.
d) How this enzyme identifies the sequence ?
e) Draw the cut ends of the DNA with sequence.
OR
Rashid isolated a natural plasmid from a bacterium and planning to facilitate cloning.
a) What are the minimum requirements for considering the isolate & plasmid as a vector ?
b) How he identifies whether a foreign DNA is inserted or not after cloning ?
Answer:
a) Recombinant DNA technology
b) Eco- R-1
c) Restriction endonuclease
d) Palindromic sequence
e)
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 1
OR
a) It should have origin of replication (ori), selectable marker for identifiying transformants, cloning sites.
b) Selectable marker which helps in identifying and eliminating non transforms and selectively permitting the growth of transformants. The markers commonly unsed are the gene encoding reistance to antibiotics such as tetracycline, ampicillin etc.

Question 2.
Diagram shows a typical agarose gel showing migration fragments. (MAY-2010)
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 2
a) Which of the bands has largest and smallest DNA fragments?
b) How can you make fragments of DNA for electrophoresis ?
c) Explain separation of DNA fragments using electrophoresis.
d) Point out a method to visualize the separated DNA fragments after electrophoresis.
Answer:
a) a is the largest DNA fragment and d is the smallest DNA fragment
b) DNA fragments can be made by cutting the DNA by restriction endonuclease.
c) Separation of DNA fragments takes place through gel electrophoresis where the cut DNA fragments
matrix. The separation takes place according to the size of the DNA.
d) The DNA separated by electrophoresis is visualized by staining it with Ethidium Bromide dye and viewing it under UV light. The fragments of DNA appears as orange coloured bands.

Question 3.
The picture given below shows the technique used forgenerating multiple copies of the gene of interest. (MARCH-2011)
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 3
a) What is the technique called?
b) Name the reactions at Step I, Step II, Step III.
c) Explain the principle underlying this technique of DNA amplification.
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 4
The above picture shows cloning vector pBR 322.
a) What is Ori? Give its importance.
b) How does the insertion of foreign DNA at Bam Hi site selected ? What is ampR?
c) How many cloning sites are depicted in this vector as shown in the figure?
Answer:
a) Polymerase chain reaction
b) Step I denaturation
Step II annealing
Stepl II extention/amplification
c) Multiple copies of gene of interest is synthesized invitro by using the set of primer,/Taq polymerase and deoxy nucleotides
OR
a) Origin of replication. Controlling the copy no.of linked DNA
b) Due to insertion of Foreign DNA at Bam H1 site, recombinant plasmid will lose tetracycline resistance, thus recombinants will not grow in the medium containing tetracycline
c) 5 cloning sites-Eco R1, Bam H1, PuvII, Pst1, Pvu1

Question 4.
In a class room seminar on cloning vectors, your friend asked to explain the steps to introduce the plasmid DNA to a bacteria cell, Micro injection and biolistics. Answer his questions. (MAY-2011)
Answer:
For this, bacterial cells must first be made ‘competent’ to take up DNA. This is done by treating them with a specific concentration of a divalent cation, such as calcium, Recombinant DNA can then be forced into such cells by incubating the cells with recombinant DNA on ice, followed by placing them briefly at 420C (heat shock), and then putting them back on ice. This helps to introduce the plasmid DNA into bacterial cell.
Micro injection – In this recombinant DNA is directly injected into the nucleus of an animal cell.
Biolistics – In this cells are bombarded with high velocity micro-particles of gold or tungsten coated with DNA.

Question 5.
Observe the relation in the first pair and fill up the blank in the second. (MAY-2011)
Cry I Ac: Control cotton bollworm
……………: Control corn borer
Answer:
Cry I Ab ………. control corn borer.

Question 6.
Restriction endonucleases are the enzymes used to cut the DNA molecules. (MARCH-2012)
a) Give the general term of the specific sequences where these enzymes cut the DNA.
b) Name the enzyme that joints the foreign DNA and vector DNA.
c) Give any two procedures to introduce the recombinant DNA into the host cell.
OR
During genetic engineering Vector with foreign DNA is transferred into a host bacterium. The next target will be the selection of transformants from non- ‘ transformants.
How antibiotic resistance and insertional inactivation is exploited for this purpose?
Answer:
a) Palindromic sequence or recognition sequence
b) DNAIigase
c) Direct gene transfer by gene gun (biolistics) Direct gene transfer by micro injection
OR
Antibiotic gene is used us selectable marker to identify the recombinants from non recombinant. Insertional inactivation is used to identify the transformants as white coloursed and non transformants as blue coloured

Question 7.
While studying nucleotide sequence. Raj found the following sequence which can be recognized by some enzymes : (MAY-2012)
5′- GAATTC – 3′
3′- CTTAAG – 5′
a) Give salient features of this sequence.
b) Write name of enzymes which recognize such sequences.
c) Elaborate importance of this enzyme in Genetic engineering.
OR
A group of students came to know about recombinant DNA technology. They want to know how scientists can produce a new desired product using rDNAtechnology. Can you give them an idea about the important steps that are involved in this process?
Answer:
a) Palindromic sequence
b) Restriction endonuclease enzyme
c) The enzyme cut at specific nucleotide sequence and get sticky ends.The same restriction enzyme is used to cut both foreign DNA and cloning vector.
OR
Recombinant DNA technology involves several steps.
They are
1) Isolation of the Genetic Material (DNA)
2) Cutting of DNA at Specific Locations
3) Amplification of Gene of Interest using PCR
4) Insertion of Recombinant DNA into the Host Cell Organism
5) Obtaining the Foreign Gene Product
6) Down stream processing

Question 8.
Jaya read in a Biotechnology book that alien DNA can be introduced into host ceil by micro injection and biolistics. Explain these methods. (MARCH-2013)
Answer:
1) Micro-injection- The recombinant DNA is directly injected into the nucleus of an animal cell.
2) Biolistics or gene gun- The cells are bombarded with high velocity micro-particles of gold or tungsten coated with DNA. It is suitable for plants.

Question 9.
Genetic Engineering include creation of recombinant DNA with the help of restriction enzymes. (MARCH-2013)
a) Explain recombinant DNA technology.
b) What are restriction enzymes? Name a restriction enzyme.
Answer:
a) Recombinant DNA technology involves several steps.
They are
1) Isolation of the Genetic Material (DNA)
2) Cutting of DNA at Specific Locations
3) Amplification of Gene of Interest using PCR
4) Insertion of Recombinant DNA into the Host Cell /Organism
5) Obtaining the Foreign Gene Product
6) Downstream Processing
b) Restriction enzyme is used to cut DNA at specific nucleotide sequence Examples are EcoR1 ,Hind111 etc.

Question 10.
Gel electrophoresis is a technique to separate fragments of DNA from a mixture. Some of the events of electrophoresis are given below. Arrange the events in order: (MAY-2013)
1) Cutout DNA bands
2) Expose to UV
3) Force DNA to move through gel
4) Stain DNA with ethidium bromide.
Answer:
Force DNA to move through the gel, stain DNA with ethidium bromide expose to UV ,cut out DNA bands.

Question 11.
Identify palindrome sequence from the following. (MAY-2013)
1) 5′-GAATTC-3′
3′-CTTAAG-5′
2) 5′-ATCG-3′
3′-TACG-5′
3) 5′ – AAAAA – 5′
5′ – TTTTT – 3′
4) 5′-CCCCC-3′
3′-GGGGG-5′
Answer:
5′ ___GAATTC ____ 3′
3′ ____ CTTAAG ____ 5′

Question 12.
_________ are the enzymes used for cutting the DNA molecule into fragments. An example for this type of enzyme is Eco Ri. What does Eco, R and I stand for? (MARCH-2014)
Answer:
UB Restriction Endonuclease,
Eco- Escherichia coli, R- letter ‘R’ is derived from the name of strain, I— It indicate the order in which the enzymes were isolated from that strain of bacteria.

Question 13.
Use of a thermostable DNA polymerase from the bacterium, Thermus aquaticus made it possible to generate billion copies of DNA in a very short time using a process. (MARCH-2014)
a) Name the process.
b) Name the three important steps involved in this process.
Answer:
a) Polymerase chain reaction
b) Denaturation, Anealing, Extension

Question 14.
There are many features required to facilitate successful cloning in to a vector. Write shortly any two such features required by a vector. (MAY-2014)
Answer:
Origin of replication (ori): This is a sequence from where replication starts and any piece of DNA when linked to this sequence can be made to replicate within the host cells.
Selectable market: Genes encoding resistance to antibiotics are considered as useful selectable markers which helps in identifying and eliminating non transformants and selectively permitting the growth of the transformants.

Question 15.
Recombinant DNA technology can be accomplished only if we have the following key tools, ie. Restriction enzymes, Polymerase enzyme, Ligases and Vectors. (MARCH-2015)
State the functions of
a) Ligases
b) Restriction Enzymes
Answer:
a) Ligase- Enzyme which is used to join the DNA fragments
b) Restriction Enzymes- It is used to cut DNA at specific locations

Question 16.
Figure representing the reactions associated with Polymer Chain Reaction (PCR). Name the steps A, B, C in the process (MARCH-2015)
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 5
Answer:
A — Denaturation
B — Annealing
C — Extension/Elongation

Question 17.
Observe the cloning vector and explain the following: (MAY-2015)
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 6
a) Ori
b) Bam HI
Answer:
a) ori-origin of replication
b) Bam HI- restriction enzyme

Question 18.
A multinational company successfully cloned a gene of interest and also optimized the conditions to induce the expression of target protein. (MAY-2015)
a) Name the apparatus for large scale production of such proteins.
b) Briefly explain the apparatus.
Answer:
a) Bioreactor
b) It is the large culture vessel (100-1000 litres) used for the production of large quantities of recombinant protein, enzymes, etc. it,provides optimum growth conditions (temperature, pH, substrate, salts, vitamins and oxygen). It consist of agitator system, an oxygen delivery system and a foam control system, a temperature control system, pH control system and sampling ports.

Question 19.
Observe the sketch of stirred-tank bioreactor and label the parts A, B. C and D. (MARCH-2016)
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 7
Answer:
A – motor
B – Foam breaker
C- Flat bladed impeller
D – Acid or base for PH Control

Question 20.
Manipulating with nucleic acid is a trend in Biotechnology. (MARCH-2016)
a) Name any one organism used as vector.
b) What are DNA polymerase?
Answer:
a) Ecoli
b) It helps to add nucleotide one by one on template srtand (polymerization of deoxy ribonucleotides)

Question 21.
Electrophoresis is a method commonly used in Biotechnology. Write briefly about GelElectrophoresis. (MAY-2016)
Answer:
In this method DNA fragments are separated accord-ing to their charge and size.
DNA is negatively charged molecules they move through agarose gel towards positively charged anode, DNA fragments are stained by Ethidium bromide, separated fragments can be observed as orange coloured bands under UV light.

Question 22.
Genetic engineering is a promising branch recently developed in biological science. (MAY-2016)
a) Expand PCR and name three steps in each cycle.
b) What is a plasmid? Name three features required for cloning vectors.
Answer:
a)PCR or polymerase chain reaction involves 4 steps
1) Denaturation – It involves the separating of DNA strands.
2) Annealing – The double strands are synthesised from free nucleotides by the action of DNA polymerase.
3) Extension – The length of the strands are increased as a result of addition of more and more nucleotides. The process of replication is repeated many times & billions of copies of DNA is synthesised.
OR
b)Plasmids are circular double stranded DNA molecules occurring in extra chromosomal state
1) Ori (Origin of replication) it is the sequence from where replication starts.
2) Cloning sites: For linking the alien DNA into the vector, there must be preferably single recognition sites because more than one recognition sites within the vector results several fragments.
3) Selectable markers are employed in rDNA technology for selecting the recombinants from non recombinants.

Question 23.
The following photograph shows the result of a technique showing the separation of DNA. (MARCH-2017)
Plus Two Botany Chapter Wise Previous Questions Chapter 4 Biotechnology Principles and Processes 8
a) Name the technique.
b) How the separated DNA is visualized?
c) DNA fragments of size 500bp and 2000 bp are separated by this process. Which fragment will migrate fast. Why?
OR
B) Different methods have been suggested to introduce alien DNA into host cells. Given and explain any three methods adopted for this purpose.
Answer:
A) a) Gel electrophoresis
b) The separated fragments of DNA can be visualized only after staining with ethidium bromide followed by exposure to uv radiation. DNA will be visualized as bright orange coloured bands on the gel.
c) 500 bp migrate fast because it is the smaller fragment found nearer to anode than other fragments on the gel.
OR
B) 1) Micro-injection-recombinant DNA is directly injected into the nucleus of an animal cell.
2) Biolistics or gene gun – cells are bombarded with high velocity micro-particles of gold or tungsten coated with DNA. It is suitable for plants.
3) Disarmed pathogen – vectors when allowed to infect the cell, transfer the recombinant DNA into the host.

Question 24.
Sequences of base pairs in DNA that reads the same on both the strands when the orientation of reading is kept the same are called ______ sequences. (MARCH-2017)
Answer:
Palindromic nucleotides

Question 25.
Origin of replication and selectable markers are the two important features required for a cloning vector. Explain their role in facilitating cloning. (MAY-2017)
Answer:
Up Origin of replication – It is the start of replication required for making many copies of the desired gene. Selectable markers – They are antibiotic-resistant genes that helpful in identifying recombinants from non-recombinants.

Question 26.
Rhizome, bulbil, offset and the bulb is different methods of vegetative reproduction in plants. Of these, the vegetative reproductive structures of Agave and Ginger are and respectively. (MAY-2017)
Answer:
Bulbil, Rhizome

Question 27.
Denaturation, Annealing and Extension are three steps of a process used for gene amplification: (MAY-2017)
a) Name the process.
b) Name the organism from which the DNA polymerase for this process is extracted.
Answer:
a) Polymerase Chain Reaction (PCR)
b) Thermusaquaticus

Plus Two Botany Chapter Wise Previous Questions Chapter 3 Strategies for Enhancement in Food Production

Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 3 Strategies for Enhancement in Food Production.

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 3 Strategies for Enhancement in Food Production

Question 1.
Johny, a Plus Two student is from a tribal colony with lower level of vitamins, minerals and protein deficiency. He wishes to be a plant breeder to help the public by producing new crops with high levels of vitamins, minerals, protein etc. Identify the phenomenon. (MARCH-2010)
Answer:
Biofortification

Question 2.
In mid 1960’s as a result of various plant breeding techniques, there was a drastic increase in food production in our country. This phase is often referred as _______. (MAY-2010)
Answer:
Green revolution

Question 3.
Tissue culture is a fast and efficient system for crop improvement. Scientists in a research institution wants to produce a hybrid of potato and tomato. Is it possible to make such a hybrid ? If possible, explain how. (MAY-2010)
Answer:
Somatic hybridisation – The isolated cells from to-mato and potato are converted into naked protoplasts by digesting the cell walls. Isolated protoplasts of the two plants are fused to get hybrid protoplasts which is further grown to form a new plant. Somatic hybrid of tomato and potato is called Pomato.

Question 4.
Ram Singh is a conventional wheat breeder, One the promising wheat varieties is found to be susceptible to leaf rust.
What breeding steps he will adopt to make his original promising variety resistant to leaf rust? (MARCH-2011)
Answer:
Breeding steps
a) screening germ plasm
b) hybridization of selected parents
c) selection and evaluation of hybrid
d) testing and release of new varieties

Question 5.
The method of producing thousands of plantlets through tissue culture is called ______.  (MARCH-2011)
These plantlets which are genetically identical to each other are called _______.
Answer:
a) Micropropagation
b) Somaclones

Question 6.
Being a member of the Committee of People’s Planning Programme of your Panchayat, suggest two common fresh water fishes to grow in the fresh water fishery project undertaken by your Panchayat.  (MAY-2011)
Answer:
Catla and Rohu

Question 7.
If the tomato plants of your village are virus affected, which part of the plant would you recommend to culture for virus free plants?  (MAY-2011)
Answer:
Meristem /Shoot tip

Question 8.
The regeneration of whole plants from any part of the plant grown under sterile conditions is called tissue culture.
a) The general term for the part of the plant taken out for tissue culture is _______.  (MARCH-2012)
b) The capacity to generate a whole plant from any plant cell is ______.
Answer:
a) Explant
b) Toti potency

Question 9.
Raju went to a Rice Research station on his study tour. There he noticed a scientist working on rice plants using scissors and forceps. To his surprise he saw the scientist covering the inflorescences with paper bags. (MARCH-2012)
a) Name the techniques the scientist was doing.
b) Give the purpose of these techniques.
Answer:
a) Emasculation & Bagging
b) It helps to prevent the contamination of unwanted pollen

Question 10.
A newspaper report read like this. (MARCH-2012)
“Conventional agricultural products like cereals, pulses and other seeds may not be able to meet the demand of food according to the increase in population. So focus has to be shifted to alternate food sources like SCP’s.
a) What are SCP’s?
b) Give one example of SCP’s.
c) What are the advantages of SCP’s?
Answer:
a) Single cell protein. It is alternative food source human consumption
b) Spirulina
c) They are protein rich food besides carbohydrate, fat and minerals.

Question 11.
Continued inbreeding, usually reduces fertility and causes non productivity. This is called ________. (MAY-2012)
Answer:
Inbreeding depression

Question 12.
Bee keeping requires some specialized knowledge for success. (MAY-2012)
a) What is the alternate name for Bee Keeping?
b) Give your suggestions for successful bee
Answer:
a) apiculture
b) i) Knowledge of the nature and habits of bees
ii) Selection of suitable location for keeping the beehives
iii) Catching and hiving of swarms (group of bees)
iv) Management of beehives during different seasons, and
Handling and collection of honey and beewax.

Question 13.
Plant breeding programmes are carried out in a systematic way in research organizations. Explain main steps in breeding to produce a new genetic variety. (MARCH-2013)
Answer:
i) Collection of variability
ii) Evaluation and selection of parents:
iii) Cross hybridisation among the selected parents:
iv) Selection and testing of superior recombinants.
v) Testing, release and commercialisation of new cultivars:

Question 14.
MOET is a programme for herd improvement. Expand MOET. (MARCH-2013)
Answer:
MOET- Multiple Ovulation Embryo Transfer Technology

Question 15.
It is observed that continuous inbreeding of animals for 4 – 6 generations produce progeny with reduced fertility and productivity. What measures can be taken to improve fertility and productivity of progeny? (MAY-2013)
Answer:
The selected animals of the breeding population should be mated with unrelated superior animals of the same breed. This is usually helps to restore fertility and yield. The offspring of such a mating is known as an out-cross.
A single out cross helps to overcome inbreeding depression.

Question 16.
crop are completely used up and hence genetic variations are to be created for crop improvement. Suggest any one method for creating genetic variation. (MAY-2013)
Answer:
Mutation breeding

Question 17.
Vidya got a plant which was affected with a viral disease. Her objective is to raise a disease free plant from this infected plant through tissue culture. (MARCH-2014)
a) Which part of the plant should be selected as the explant?
b) State the reason for the selection of this part as the explant.
Answer:
a) Shoot tip
b) Conducting tissues are not present

Question 18.
Plant breeding involves techniques for manipulating plants in order to create the desired plant types. State the steps involved in the production of a new genetic variety of a crop. (MARCH-2014)
Answer:
The main steps in breeding a new genetic variety of a crop are:
i) Collection of variability
ii) Evaluation and selection of parents:
iii) Cross hybridisation among the selected parents:
iv) Selection and testing of superior recombinants Testing, release and commercialisation of new cultivars.

Question 19.
The local people in a village wanted to produce a crop with improved nutritional qualities. What are the major objectives to be included to improve the nutritional qualities? (MAY-2014)
Answer:
i) Protein content and quality
ii) Oil content and quality
iii) Vitamin content; and
iv) Micro nutrient and mineral content

Question 20.
Observe the relation in the first pair and fill up the blank in the second. (MAY-2014)
a)

Crop Variety Resistance to disease
Chilli Pusa

Sadabahar

Chilly or tobacco

Mosaic virus

Brassica ………………… White rust

b)

Crop Variety Insect pest
Flat bean Pusa

sawani

Jassids ,fruit borer and aphids
Okra …………………. Shoot and fruit borer

Answer:
a) Pusaswarnim
b) PusaSawani

Question 21.
In a debate one of the speaker reported like this. (MARCH-2015)
“Continuous inbreeding leads to inbreeding depression.” If so, define the following:
a) Outcross
b) Crossbreeding
Answer:
a) It is the practice of mating of animals within the same breed, but having no common ancestors on either side of their pedigree up to 4-6 generations. The offspring of such a mating is known as an out-cross.
b) In this superior males of one breed are mated with superior females of another breed. Hisardale is a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Marino rams.

Question 22.
250 Kg. cow produces 200g of protein/day. In the same period 250 g of Methylophilus methylotrophus produce 25 tonnes of protein. Then what is single cell protein?  (MARCH-2015)
Answer:
One of the alternate sources of proteins for animal and human nutrition is Single Cell Protein (SCP)
Eg- Spirulina

Question 23.
In a Grama Panchayat, Members wanted to start a Bee-keeping industry. What are your suggestions for successful bee keeping ?  (MAY-2015)
Answer:
For successful bee-keeping it requires
i) Knowledge of the nature and habits of bees.
ii) Selection of suitable location for keeping the beehives.
iii) Catching and hiving of swarms (group of bees).
iv) Management of beehives during different seasons.

Question 24.
Observe the relation in the first pair and fill up the blank in the second.  (MAY-2015)
a)

Crop Variety Resistance to disease
Brassica Pusa swarnim Wheat rust
Chilli ……………….. Chilly mosaic virus

b)

Crop Variety Insect pest
Okra Pusa sawani Shoot and fruit borer
Flat bean ………….. Juassids ,fruit borer and aphids

Answer:
a) Pusa sadabahar
b) Pusa sem 2, Pusa sem 3

Question 25.
Resistance is the ability to prevent the pathogen from causing disease.  (MARCH-2016)
1) Elucidate the steps in breeding for disease resistance.
2) Cite two examples for virus resistant plants.
OR
Tissue culture is an achievement in plant breeding. What is a somaclone ? Describe the production of somatic hybrid.
Answer:
1) a) screening of germ plasm for resistance
b) Hybridization of selected plants
c) Selection and evaluation of hybrids
d) Testing and release of new varieties
2) pusa sadabahar, parbhani kranti
OR
Morphologically and genetically similar off springs are produced through tissue culture called somaclones. Isolation of somatic cells from two different varieties Digestion of cell wall using enzymes.
Fusion of protoplast of two different varieties forming somatic hybrid protoplast.
Culture of protoplast hybrid to produce somatic hybrid.

Question 26.
a) Describe the major steps followed for the production of new genetic variety starting from the collection of germplasm upto elucidating the cultivars.  (MAY-2016)
b) A plant breeder has a rare variety of cultivar with him but unfortunately it has become infected with vims. Suggest a suitable technique to produce many viable number of progenies with a short note.
Answer:
a) Collection of variability
Evaluation and selection of parents Cross hybridisation among the selected parents Testing, release and commercialisation of new cultivars. Selection and testing of superior recombinants,
b) Meristem culture In this method virus free plants are developed because it lack conducting tissues

Question 27.
Match the following varieties with their respective crops:  (MARCH-2017)

Variety Crop
a)  Pusa Swarnim

b) Pusa Snowball

c)  Pusa Swani

d)  Pusa Sadabahar

i)    Chilly

ii)   Bhindi

iii)  Cauliflower

iv)  Brassica

Answer:

Variety Crop
a)  Pusa swarrnim

b)  Pusashubhra

c)  Pusasawani

d)  Pusa Sadabahar

i)    Brassica

ii)   Cauliflower

iii)  Bhindi

iv)  Chilli

Question 28.
Breeding crops with the objective of increased nutritional quality is called _______.  (MARCH-2017)
Answer:
Biofortification

Question 29.
Out crossing and cross breeding are two different aspects of out breeding in animals. How out crossing is different from cross breeding?  (MAY-2017)
Answer:
Out-crossing
It is mating of animals within the same breed, but having no common ancestors on either side of their pedigree up to 4-6 generations.
Cross-breeding
It is the method of mating superior males of one breed with superior females of another breed.

Question 30.
The practice of maintenance of honeybees for the production is called _______. (MAY-2017)
Answer:
Bee keeping (Apiculture)

Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants

Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 2 Sexual Reproduction in Flowering Plants.

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants

Question 1.
Given below in the diagram showing the transfer of pollen grains. (MARCH-2010)
i) Identify a & b with technical terms.
ii) Critically evaluate a & b.
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 1
Answer:
i) (a) Autogamy & (b) Geitonogamy
ii) (a) Transfer of pollen from antherto the stigma of the same flower is called autogamy.
b) Transfer of pollen from anther to the stigma of a different flower on the same plant.

Question 2.
Microsporangium is generally surrounded by four wall layers. Name the layer which nourishes developing pollen grains.   (MAY-2010)
Answer:
Tapetum

Question 3.
Match the following:  (MAY-2010)
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 2
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 3

Question 4.
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 4
Copy the picture given above and mark the following:  (MARCH-2011)
a) Connective tissue
b) Endothecium
c) Tapetum
d) Sporogenous tissue
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 5

Question 5.
Transfer of pollengrains from the anther to the sitgma of a flower is called pollination. Grass plants generally have small, inconspicuous flowers while plants belonging to many angiosperm families bear conspicuous coloured flowers. (MARCH-2011)
a) Comment on the type of pollination taking place in these two groups.
b) What are the salient features present in these two groups for effective pollination?
Answer:
a) 1) Wind pollination
2) Pollination by biotic agents

b) Floral features of wind pollination :-

  1. Light pollengrain
  2. Dry, smooth & large quantities of pollengrains
  3. Exposed stigma
  4. Lack of scent
  5. Lack of nectar

c) Floral features of animal pollination :-

  1. Large flower
  2. Colourful and fragrant with nectar
  3. Sticky pollengrain

Question 6.
After fertilization in flowering plants, seeds bearing embryos are found inside the fruits. If seeds are developed from ovules. (MARCH-2011)
a) Name the parts that given rise to embryo and fruits.
b) What is the thick wall of the fruit that is protective in function called?
Answer:
a) Zygote -> Embryo
Ovary -> Fruit
b) Pericarp

Question 7.
Teacher wrote the steps of a crop improvement programme on the blackboard as follows: (MAY-2011)
Bagging
Emasculation
Arrange the steps in correct order, explain them and name the process of crop imdorvement programme with the given steps.
Answer:
Emasculation
Bagging
If the female parent bears bisexual flowers, removal of anthers from the flower bud before the anther dehisces This step is called emasculation. Emasculated flowers have to be covered with a bag of suitable size prevent the contamination of its stigma with unwanted pollen. This process is called bagging.
The above two process are coming under Artificial Hybridisation

Question 8.
+2 students of a school at Kasargod district on their study tour collected flowers showing the following character
1) Flowers are with light pollen grains. (MAY-2011)
2) Colourful flowers.
3) Nectar producing flowers.
4) Flowers with feathery stigma.
a) Arrange the characters underdifferent pollination groups in the given table.
b) Write the name of 2 flowers pollinating through water.
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 6
Answer:
a)

Entamophilous flowers Anemophilous flowers
Colourful flowers . Flowers are with pollen grains.
Nectar producing flowers. Flowers are with feathery stigma.

b) Hydrilla, vallisneria

Question 9.
a) Hilum (MARCH-2012)
b) Funicle
c) Micropylarpole
d) Nucellus
e) Chalazalpole
d) Embryosac
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 7

Question 10.
Innermost wall layer of microsporangium which nourishes the developing pollen grain is called ________. (MAY-2012)
Answer:
Tapetum

Question 11.
In large number of plants, pollination is carried out by insects. List four characters of flowers that helps insect pollination. (MAY-2012)
Answer:
Characters of entamophilous flowers.
1) Flowers are large, colourful, fragrant and rich in nectar.
2) small flowers are clustered into an inflorescence to make them conspicuous.

Question 12.
In Papaya, male and female flowers are present in separate plants. They are said to be ______. (MAY-2012)
Answer:
Dioceous

Question 13.
In artificial hybridization, it is important to make sure that sigma is protected from unwanted pollen. This is achieved by emasculation and bagging techniques. Can you explain, how emasculation and bagging techniques are performed? (MAY-2012)
Answer:
Anthers are removed before the dehiscence of anther of female parent that bears bisexual flowers. This step is called as emasculation.
It is covered with a bag of suitable size, to prevent contamination of its stigma with unwanted pollen. This process is called bagging.

Question 14.
After syngamy and triple fusion in embryosac, embryo will be diploid and endosperm will be ________. (MARCH-2013)
Answer:
Triploid

Question 15.
Flowering plants evolved an array of adaptations to achieve pollination.(MARCH-2013)
a) Explain pollination.
b) Point out adaptations found in flowers for insect pollination and wind pollination.
c) Illustrate pollination in Vallisnaria.
(OR)
Artificial hybridization is one of the major approaches for crop improvement programme. In such crosses it is important to avoid unwanted pollen.
a) Explain how can we protect stigma from unwanted pollen.
b) How artificial pollination can be performed?
Answer:
a) It is the transfer of pollen grains to the stigma of a pistil.
b) Characters of entamophilous flowers
1) Flowers are large, colourful, fragrant and rich in nectar.
2) small flowers are clustered into an inflorescence to make them conspicuous.
Characters of anemophilous flowers
1) pollen grains are light and non-sticky.
2) They possess well-exposed stamens and feathery stigma.
3) The flowers have a single ovule in each ovary and numerous flowers packed into an inflorescence.
c) In Vallisneria, the female flower reach the surface of water by the long stalk and the male flowers or pollen grains are released on to the surface of water. The anthers eventually reach the female flowers and the stigma.
(OR)
a) It is covered with a bag of suitable size, to prevent contamination of its stigma with unwanted pollen. This process is called bagging.
b) 1) Anthers are removed before the dehiscence of anther of female parent that bears bisexual flowers. This step is called as emasculation.
2) It is covered with a bag of suitable size, to prevent contamination of its stigma with unwanted pollen. This process is called bagging.
3) When the stigma of bagged flower attains receptivity, mature pollen grains collected from anthers of the male parent are dusted on the stigma, and the flowers are rebagged, and the fruits allowed to develop.

Question 16.
In many grasses seeds are formed only after fertilization. There are reports that in some grasses, seeds are formed without fertilization. Explain the phenomenon. (MAY-2013)
Answer:
The phenomenon of formation of seeds without fertilization is called Apomixis.
Apomixis is a form of asexual reproduction that mimics sexual reproduction. In this phenomenon , the diploid egg cell is formed without reduction division and develops into the embryo without fertilization.

Question 17.
The diagramatic view of a typical anatropous ovule is show below. Copy the diagram and label the unlabelled parts. (MAY-2013)
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 8
Answer:
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 9

Question 18.
In flowering plants, double fertilization occurs during sexual reproduction. One of the events of double fer-tilization is triple fusion. Name the other event. (MAY-2013)
Answer:
Syngamy. (Fusion of egg cell with male gamete that leads the formation of zygote)

Question 19.
In flowering plants during double fertilization two events take place in the embryosac namely ______ and ______. (MARCH-2014)
Answer:
Syngamy and Triple fusion

Question 20.
From the following, select the two having haploid Chromosome number. (MARCH-2014)
a) Egg
b) endosperm
c) Zygote
d) Pollen
Answer:
Egg, pollen

Question 21.
Sunflower is pollinated by insects while rice is pollinated by wind.  (MARCH-2014)
a) How these plants are adapted to their respective type of pollination method? (Hint-any 4 points)
b) Plants can be self or cross pollinated. Write any two mechanisms existing in nature to promote cross pollination.
(OR)
a) The diagram given below shows the transverse section of a young anther. Identify the parts a, b, c and d.
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 10
The developmental stages of male gametes in plants consist of microsporogenesis and male ga- metophyte. Arrange the following terms in their correct developmental sequence.
Pollen grain
Sporogenous tissue
anther
microspore tetrad
pollen mother cell
male gamete.
Answer:
Adaptation for wind pollination
1) The pollen grains are light and non-sticky
2) They possess well-exposed stamens and feathery stigma
Adaptation for insect pollination
1) Insect-pollinated flowers are large, colourful, fragrant and rich in nectar.
2) The flowers are small, a number of flowers are clustered into an inflorescence
b) 1) pollen release and stigma receptivity are not at the same time.
2) Anther and stigma are placed at different positions so that the pollen cannot come in contact with the stigma of the same flower. Both these devices prevent autogamy.
(OR)
a) a-connective
b- epidermis
c – sporogenous tissue
d-Tapetum
b) Anther -> sporogenous tissue —> pollen mother cell —> microspore tetrad —> pollen grain —> malegamete

Question 22.
Most of the plants produce single type of flowers but Viola, Commelina and Oxalis produce two type of flowers. Explain. (MAY-2014)
Answer:
Chasm ogamous
Flowers with exposed anthers and stigma.
Cleistogamous
Flowers which do not open at all. In such flowers, the anthers and stigma lie close to each other. These flowers are example for autogamous flowers (self pollination)

Question 23.
Egg cell formation in angiosperms involves me- gasporogenesis and female gametophyte development. (MAY-2014)
a) Briefly write the various steps involved in female gametophyte development.
b) Mature angiosperm embryosac at maturity, though 8 nucleated is 7 celled.
What is your explanation related to this statement? Explain.
Answer:
a) Single megaspore mother cell (MMC) in the micropylar region of the nucellus undergoes meiotic division results in the production of four megaspores. In a majority of flowering plants, one of the megaspores is functional while the other three degenerate. Only one functional megaspore develops into the female gametophyte (embryo sac).

b) 2 polar nuclei are situated below the egg apparatus in the large central cell.
Three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus consists of two synergids and one egg cell.
The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid. Three cells are at the chalazal end and are called the antipodals.

Question 24.
Development of fruit without fertilization and are seedless known as ______. (MARCH-2015)
a) Polyembryony
b) Apomixix
c) Parthenocarpy
d) Parthenogenesis
Answer:
Parthenocarpy

Question 25.
Given below are the components related to simplified model of mineral cycling in a terrestrial ecosystem. Construct a flow chart. (MARCH-2015)
(Hint: Weathering of rock)
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 11
Answer:
Producers consumers -> detritus -> soil solution -> Minerals in rock

Question 26.
a) Reeja a science student observed the structure of mature embryosac comprising antipodals, central cells and egg apparatus. Explain each one of them. (MARCH-2015)
(OR)
b) Three different flowers are given to you in the practical class.
i) Maize
ii) Vallisneria
iii) Rose
You are asked to group them based on pollinating agents. Describe the adaptations of each flower related with the agents of pollination.
Answer:
The typical female gametophyte or embryo sac is 8-nucleate and 7-celled.
2 polar nuclei are situated below the egg apparatus in the large centraftfell.
Three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus consists of two synergids and one egg cell.
The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.
Three cells are at the chalazal end and are called the antipodals.
(OR)
1) Maize wind pollination
a. The pollen grains are light and non-sticky
b. They possess well-exposed stamens and feathery stigma
2) Vallisneria water pollination
a. Water pollinated flowers are not very colourful and do not produce nectar.
b. Pollen grains are protected from wetting by a mucilaginous covering
3) Rose Insect polination
a. Insect-pollinated flowers are large, colourful, fragrant and rich in nectar.
b. The flowers are small, a number of flowersare clustered into an inflorescence.

Question 27.
You are supplied with three different flowers such as Maize, Vallisneria and Rose and they have different pollinating agents also. (MAY-2015)
a) Differentiate the type of pollination.
b) Write their various adaptability in the plants suited to pollination.
Answer:
a) Maize -> wind pollination Vallisneria-> water pollination Rose -> insect pollination
b) In maize pollen grains are produced in large quantity, small flowers are packed into inflorescence, and stamen and stigma are exposed.
In vallisneria pollen grains are non sticky and surrounded by mucilaginous layer to prevent from wetting. They have not produced nectar and scent. In rose pollen grains are sticky and produced strong scent, the flowers are brightly coloured. it attract insect for pollination.

Question 28.
In some seeds the nucellus may be persistent. Such nucellus is called _______. (MARCH-2016)
a) Endosperm
b) Scutellum
c) Plumule
d) Perisperm
Answer:
d) Perisperm

Question 29.
What is a false fruit ? Cite an example. (MARCH-2016)
Answer:
Fruit is developed from parts of flower other than ovary.
Eg. apple and strawberry

Question 30.
Many of the flowering plants have developed some devices for discouraging in breeding. Write any two of them. (MARCH-2016)
Answer:
Self incompatibility
Production of unisexual flowers

Question 31.
The development of pollen grains in Angiosperms is called _______. (MAY-2016)
a) Microsporogenesis
b) Embryogenesis
c) Megasporogenesis
d) Gametogenesis
Answer:
Microsporogenesis

Question 32.
Which of the following part in a flower is haploid? (MAY-2016)
a) Antherwall
b) Pollen mother cell
c) Synergid
d) Secondary nucleus
Answer:
c) Synergid

Question 33.
Observe the following diagram and label A, B, C and D. (MAY-2016)
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 12
Answer:
A) Epidermis
B) Endothecium
C) Middle layers and
D) Tapetum

Question 34.
In aquatic plants like water hyacinth and water Lily the pollinating agent is ________. (MAY-2016)
a) Wind and insect
b) Water
c) Birds and butterflies
d) Aquatic organisms
Answer:
a) Wind and insect

Question 35.
A date palm seed discovered during archeological investigation retained viability even after 10000 years. The retention of viability is due to the state of inactivity of embryo called ________. (MARCH-2017)
Answer:
Dormancy

Question 36.
When the pollen is transferred from anther to the stigma of the same flower, the pollination is called autogamy.
a) Cleistogamous flowers are invariably autogamous. Explain. (MARCH-2017)
b) Geitonogamy is functionally cross pollination, but genetically similar to autogamy. Justify the statement.
Answer:
a) In this, flowers are not open pollen falls to the stigma of the same flower and seed setting takesplace without the influence of external agency.
b) In geitonogamy transfer of pollen grains from the anther to the stigma of another flower of the same plant.
Functionally geitonogamy is a type of cross pollination but it is genetically similar to autogamy since the pollen grains come from the same plant.

Question 37.
The thick protective covering of the fruit is known as ______. (MARCH-2017)
Answer:
Pericarp

Question 38.
Nature has mechanisms to promote outbreeding in plants. Explain any two mechanisms existing in plants to promote outbreeding. (MARCH-2017)
Answer:
1) Anther and stigma are placed at different positions so that the pollen cannot come in contact with the stigma of the same flower.
2) Self-incompatibility is the genetic mechanism in which pollen cannot germinate on the stigma of the same flower or other flowers of the same plant by inhibiting pollen germination or pollen tube growth in the pistil.

Question 39.
Rose is a flower pollinated by insect while in paddy pollination is by wind. Give any three adaptations existing in these plants to facilitate their respective mode of pollination. (MAY-2017)
(OR)
(B) Double fertilization and triple fusion are the two terms associated with angiosperm fertilization.
a) What is double fertilization?
b) Explain triple fusion.
c) Give the ploidy level of
i) endosperm
ii) zygote
Answer:
(A) Pollination in Rose
1. Flowers are large and colourful
2. They are fragrant and rich in nectar
3. Pollen grain are sticky
Pollination in Paddv
1. Pollen grains are light weight and non-sticky.
2. They possess well-exposed stamens
3. They possess feathery stigma.
(OR)
(B) a) It is the fertilization take place in two times. It involves syngamy and triple fusion.
b) It is the fusion of two polar nuclei and male gametes and results primary endosperm nucleus (PEN)
c) i) endosperm – 3n
ii) zygote-2n

Question 40
Identify the following parts of a dicot embryo. (MAY-2017)
Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants 13
Answer:
a- plumule
b – cotyledons
c – hypocotyle
d – radicle

From First Showers Questions and Answers Class 8 English Unit 4 Chapter 2 Kerala Syllabus Solutions

You can Download From First Showers Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 8th Standard English Solutions Unit 4 Chapter 2  helps you to revise complete Syllabus and score more marks in your examinations.

Kerala State Syllabus 8th Standard Hindi Solutions Unit 4 Chapter 2 First Showers (Nalini Sharma)

Std 8 English Textbook From First Showers Questions and Answers

First Showers By Nalini Sharma

First Showers PoemQuestion 1.
How does the rain soothe the poet’s nerves?
Answer:
The rain soothes the poet by getting rid of heat and fatigue.

HSSLive.Guru

Question 2.
Why do the trees look magnificent?
Answer:
The rain washes the leaves of the trees and the trees look magnificent and shining.

First Showers Meaning Question 3.
What do the travelers feel when it rains?
Answer:
They feel relieved.

The Shower Poem Appreciation Question 4. Comment on the expression drenched me on the sly.
Answer:
The poet is .completely drenched by the mischievous raindrops.

First Showers Textbook Activities And Answers

Activity 1.

Kerala Syllabus 8th Standard English Solutions Unit 4 Chapter 2 First Showers 1
Answer:

Explanations Expressions/lines from the text
The poet’s face was dry. parched face
She got soaked in the rain. soaked in rain
She was tired. Weary lines… daylong heat & fatigue
The heat and fatigue made her weary. Weary lines… daylong heat & fatigue
The trees were wet and beautiful. dressed in washed green looked magnificent
The poet stood in wonder. Marveling at this wonder­ful gift of nature
The poet returned home. I hurried home through the gurgling water

Activity 2.

Read the lines:
‘Wet clothes clung to my body like an infant
To its mother’s bosom;………..
Here, the clinging of the ‘wet clothes’ is compared to ‘an infant clinging to its mother’s bosom………
This is an example for a simile. Now, develop similes from the fol¬lowing hints.
1. The tree stands like ………………
2. The moon looked at me ………….
3. The flower smiles ………………..
4. The thunder roared like …………….
Answer:
1. a giant
2. like a queen
3. like an infant
4. a lion

Go through the following sentences that contain similes and metaphors. Classify them.

1. Manu is as hungry as a horse.
2. The car was a jet when it passed by us.
3. The cat’s fur was blanket of warmth
4. There were fireworks lanterns in sky.
5. You are as brave as a lion.
6. Ian Thorpe is a fish when he swims.
7. She is as pretty as a picture.
8. The moon was a misty shadow.
Answer:
Simile:
1. Manu is as hungry as a horse
2. You are as brave as a lion
3. She is as pretty as a picture
Metaphors:
4. The car was a jet when it passed by us
5. The cat’s fur was a blanket of warmth
6. There were fireworks lantern in the sky
7. Ian Thorpe is a fish when he swims
8. The moon was a misty shadow

First Showers Additional Questions and Answers

First Showers Question 1.
Read the lines from the poem ‘ First Showers’ and answer the questions that follow.

As I returned from my workplace
cool drops kissed my parched face
soon the first showers caught me unawares
and soaked me, soothing my frayed nerves
The weary lines did it promptly erase
Of daylong heat and fatigue from my visage
Wet clothes clung to my body like an infant
To its mother bosom; unsteady my gait
The dusty trees stood bathed in an instant
Dressed in washed green looked magnificent
The scented earth resplendent in dampened glory
sucked in dust giving respite to the travelers weary
To thank the rain God I looked up in the sky
More drops drenched me on the sly
Marveling at this wonderful gift of nature
I hurried home wading through the gurgling water
a. Pick out the line from the poem which means ‘ the face of a person’.
b. Comment on the expression ‘ drenched me on the sly’
c. Why do the trees look magnificent?
d. How did the rain soothe the frayed nerves of the poet?
Answer:
a. Visage
b. The poet is completely drenched by the mischievous raindrops.
c. The rain washes the leaves of the trees and the trees look magnificent and shining.
d. The rain soothes the poet by getting rid of the heat and fatigue.

HSSLive.Guru

First Showers Poem Lines Question 2. Read the given passage carefully and answer the questions that follow.
Jagadananda Roy was one of the teachers at the Santiniketan school. He was known for his strictness and fiery temper. Once, Rabindranath Tagore had decided to stage a play at Santiniketan. A young boy was chosen for a particular role in the play. Tagore sent for the boy to be fetched from the class. Jagadananda Roy was then taking the boy’s mathematics class. Visibly annoyed by the student’s performance he sent back the messenger with the terse reply, “Tell Gurudev that during my class boys don’t go dancing and performing’. Tagore’s colleagues were visibly embarrassed at Jagadananda’s reply but Tagore was unmoved. Smiling he replied, “ The teacher is angry. The only way he’s going to release the boy now is to ask him to be a part of the play”. That year Jagadananda performed in the play himself. He never dis-agreed to release one of his students for a rehearsal later!’
a. What was the subject taught by Jagadananda Roy at the Santiniketan school?
b. On what occasion did Jagadananda Roy refuse to obey Tagore’s instruction?
c. How did Tagore solve the issue of fetching the boy from Jagadananda Roy’s class?
d. Why were the teachers of Santiniketan embarrassed?
e. Pick out the word from the passage that means, ‘someone that you work with’.
Answer:
a. Mathematics
b. He was annoyed by the student’s performance in the class.
c. By making Jagadananda Roy also a part of the play.
d. Because of the terse reply to Gurudev.
e. Colleague

First Showers Summary in English

The poet tells about how the cool raindrops embraced her face when she was returning from her work. She explains how she was soaked and though it was surprising she felt very comforted. It wiped out the lines of a daylong tiredness from her face. The rain held tightly to her like a baby clinging on to its mother’s breast. Then she describes how her steps became unsteady.

The rain washed off all the dust on the trees making them look beautiful in their green color. The smell of the earth was very appealing and it sucked all the dust in, giving a calm surroundings for travelers who are tired. Then she looked up in the sky to thank God when more raindrops kept falling on her. Very amazed at this wonderful gift of nature she quickly walked back home.

First Showers Summary in Malayalam

Kerala Syllabus 8th Standard English Solutions Unit 4 Chapter 2 First Showers 2

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First Showers Glossary

Kerala Syllabus 8th Standard English Solutions Unit 4 Chapter 2 First Showers 3
Kerala Syllabus 8th Standard English Solutions Unit 4 Chapter 2 First Showers 4