Kerala Plus Two Botany Question Paper March 2024 with Answers

Teachers recommend solving Kerala Syllabus Plus Two Botany Previous Year Question Papers and Answers Pdf March 2024 to improve time management during exams.

Kerala Plus Two Botany Previous Year Question Paper March 2024

I. Answer any 3 questions from 1-4. Each carries 1 score. (3 × 1 = 3)

Question 1.
Choose the correct answer and fill up the blanks. In grasses the monocot embryo contains single cotyledons named. (Plumule, Radicle, Scutellum, Coleorhiza)
Answer:
Scutellum.

Question 2.
In Recombinant DNAtechnology, precipitated DNA can be separated by ______.
Answer:
Spooling

Question 3.
A single stranded DNA or RNA tagged with radioactive molecule is called
(a) Plasmid
(b) Probe
(c) Clone
(d) Vector
Answer:
b) Probe.

Question 4.
Sun is the only source of energy for all ecosystem on earth. But one exception. What is that?
Answer:
Deep sea hydro-thermal ecosystem I Deep Sea.

II. Answer any 9 questions from 5-15. Each carries 2 scores. (9 × 2 = 18)

Question 5.
Observe the diagram of Pollen grain given below and answer the questions.

(a) Identify the cell ‘A’ and ‘B’.
(b) Write the two features of ‘A’.
Answer:
(a) A – Vegetative cell
B – Generative cell

(b) Vegetative cell is bigger / has abundant food reserve I has large irregularly shaped nucleus. (Any two features)

Question 6.
Name the special cellular thickening present in the synergid at micropylar end. Write its function.
Answer:
Filiform apparatus. It plays an important role in guiding the entry of pollen túbe into the synergids.

Question 7.
What are the two core techniques that enabled the birth of modern biotechnology?
Answer:
Genetic engineering. Bioprocess engineenng I Chemical engineering processes.

Question 8.
Explain any two methods by which recombinant DNA can be directly introduced into the host cell.
Answer:
Microinjection : Direct injection of recombinant DNA (rDNA) into the nucleus of an animal cell is called microinjection  It is the rDNA transfer method for animal cell.

Biolistics : Bombardment of plant cell with high velocity micro particle of gold or tungsten coated with DNA is called biolistics I It is the rDNA transfer method for plant cell.

Question 9.
The first trarisgenic cow p roduced human protein enriched milk. Name the cow and the
protein found in milk.
Answer:
The first transgenic cow is Rosie. The protein is aipha-lactalbumin I Human protein.

Question 10.
Match the following

A	B
1. Biopiracy	A. ADA deficiency
2. Gene Therapy	B. Basmathi Rice
3. RNA Interference	C. Cry gene
4. Bacillus thuringiensis	D. Melodegynae incognita

Answer:

A	B
1.Biopiracy	Basmati Rice
2. Gene Therapy	ADA deficiency
3. RNA Interference	Meloidogyne incognitia
4. Bacillus thurengiensis	Cry gene

Question 11.
the following graph shows two types of population growth curves.

(1) Name the growth curve ‘a’ and ‘b’.
(2) What does ‘K’ stands for?
Answer:
(1) a) Exponential growth I J shaped curve I Geometric growth model.
b) Logistic growth / Verhulst-Pearf Logistic Growth I Sigmoid Growth I S-shaped curve.

(2) K – Carrying capacity.

Question 12.
Parasites evolved special adaptations to live on host. What are they?
Answer:

• The loss of unnecessary sense organs
• presence of adhesive organs or suckers to cling on to the host
• loss of digestive system
• high reproductive capacity.

Question 13.

The figure depicts pyramid of energy.
(a) Pyramid of energy is always upright, can never be inverted. Justify
(b) Which are the other two ecological pyramids?
Answer:
(a) When energy flow from a particular trophic level to the next level some energy is lost as heat at each step. Only 10% of the energy is transferred to each trophic level from the lower trophic level according to law of 10%.

(b) Pyramid of numbers, Pyramid of biomass.

Question 14.
A list of different organism in an ecosystem are given below. Arrange them in 1^st, 2^nd and 3^rd and 4^th trophic level. (Phytoplankton, Man, Fish, Zooplankton)
Answer:
Phytoplankton → Zooplankton → Fish → Man

Question 15.
Rate of Biomass production in an ecosystem is called productivity. Productivity are divided into two, GPP and NPP.
(a) Expand GPP & NPP.
(b) Write the equation relating GPP with NPP.
Answer:
(a) GPP — Gross Primary ProductMty
NPP – Net Primary Productivity
b) GPP-R=NPR

III. Answer any 3 questions from 16 to 19. Each carries 3 scores. (3 × 3 = 9)

Question 16.
Observe the diagram and answer the following questions:

(1) Label‘a’,‘b’,‘c’and”d’.
(2) Name the diploid cell found in embryo sac.
Answer:
(1) a — Antipodals
b — polar nuclei
c — Synergids
d — Egg I Female gamete

(2) Central cell.

Question 17.
The genes of organism can be altered by Manipulation. Such organisms are called Genetically Modified Organism (GMO). List any 3 merits of G.M. Plants.
Answer:
Merits of G.M. Plants includes:

• Made crops tolerant to abiotic stress (cold, drought, salt & temperature)
• Develop pest resistance
• Helped to reduce post-harvest losses

Question 18.
Observe the figure given below:
(1) Fill in the blanks a, b, and c in the figure.
(2) Write the name of this process.
(3) What is the name of thermostable DNA polymerase enzyme used in this techniques?

Answer:
(1) a. Denaturation
b. Annealing
c. Extension.

(2) Polymerase Chain Reaction

(3) Taq Polym erase (from the bacteria Therm us aquaticus).

Question 19.
Given below are examples of some population interactions. Identify and define the interaction.
(a) Cattle egret and grazing cattle
(b) Fig tree and wasp
(c) Cuscuta growing on hedge plants.
Answer:
(a) Commensalism: It is +, O interaction In this interaction one species is benefitted and the other is neither behefitted nor harmed.

(b) Mutualism : It is +, + interaction In this interaction both the species are benefrited.

(c) Parasitism: It is +, – interaction I in this interaction only one species is benefited and the interaction is detrimental to the other species Interaction between host and parasite.