Kerala Plus One Botany Question Paper September 2021 with Answers

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf September 2021 to improve time management during exams.

Kerala Plus One Botany Previous Year Question Paper September 2021

I. Answer any 3 questions from 1 to 6. Each carries 1 score. (3 × 1 = 3)

Question 1.
Obseve the first pair and fill in the blank.
Lichen : association with fungi and algae.
______ : association of fungi with roots of higher plants.
Answer:
Mycorrhiza

Question 2.
Fill in the blank.
DNA synthesis take place in the ______ phase of cell cycle.
Answer:
S-phase

Question 3.
Name the plant hormone which helps to the ripening of fruits.
Answer:
Ethylene

Question 4.
Fill in the blank.
A flower having both feynoecium and Androecium is _____
Answer:
Bisexual flower

Question 5.
Name a bacteria responsible for nitrification.
Answer:
Nitrosomonas/nitrobactor

Question 6.
Name the unicellular fungus used for making bread.
Answer:
Yeast

II. Answer any 9 questions form 7 to 24. Each carries 2scores. (9 × 2 = 18)

Question 7.
Complete the table withappropriate terms:
Answer:
(a) Green Algae
(b) Phaeophyceae
(c) Red algae
(d) Laminarin/Mannitol

Classes	Common Name	Stored food
Ghlorophyceae	(a)	Starch
(b)	Brown algae	(d)
Rhodophyceae	(c)	Florideam starch

Question 8.
The arrangement of veins and veinlets in the lamina of leaf is termed as venation. Write any two types of venation.
Answer:
Recticulate and Parallel Venation

Question 9.
Match the folloiwng:

Column A	Column B
Sub-stages of Meiosis 1	Events
(i) Diakinesis	(a) Formation of chiasmata
(ii) Zygotene	(b) Crossing over
(iii) Pachytene	(c) Synapsis
(iv) Diplotene	(d) Terminalisation of chiasmata

Answer:

Column A	Column B
Sub-stages of Meiosis 1	Events
(i) Diakinesis	(d) Terminalisation of chiasmata
(ii) Zygotene	(c) Synapsis
(iii) Pachytene	(b) Crossing over
(iv) Diplotene	(a) Formation of chiasmata

Question 10.
Mitochondria is known as the power house of the cell. Why?
Answer:
They produce cellular energy in the form of ATP, stored and distributed for various cell activities hence they are called power houses of the cell.

Question 11.
Write any two functions of cell membrane.
Answer:
Cell growth, formation of intercellular juctions, secretion, endocytosis, cell division, transport of the molecules (Any two)

Question 12.
Light reaction is process involved in photosynthesis.
(a) What is light reaction?
(b) Where does it take place
Answer:
(a) It is the first step of photosynthesis in which trapping of light energy takes place and the synthesis of ATP and NADPH
(b) Grana membrane

Question 13.
In some plants that are adpted to dry tropical region have the C₄ pathway.
(a) Name the special type of anatomy seen in C4 plants.
(b) List out any two plants that shows C₄ pathway.
Answer:
(a) Kranz Anatomy
(b) Maize and sorghum

Question 14.
Sigmoid curve of growth is a characteristic of living organism growing in natural environment. Write any two phases seen in sigmoid growth curve.
Answer:
Lag phase/Exponential phase/Stationary phase (Anty two)

Question 15.
Write any two events take place in z-scheme of light reaction.
Answer:

1. Formation of ATP and NADPH
2. Splitting of water and release of oxygen.

Question 16.
Water movement in the root layer to xylem occurs by two distinct pathways. Which are they?
Answer:

1. Apoplast
2. Symplast

Question 17.
Write any two functions of Mesosomes.
Answer:
It helps in

1. Cell wall formation
2. DNA replciation and distribution to daughter cells
3. Respriation
4. Secretion (any two)

Question 18.
The Calvin cycle represents the main events in Dark reaction.
(a) Name the three main stages of Calvin cycle.
(b) What is the main product of Calvin cycle?
Answer:
1. Carboxylation
2. Reduction
3. Regeneration

b) Sucrose/ Starch

Question 19.
Agar is a commercial product obtained from algae.
(a) Name one alga from which agar is obtained.
(b) Write any one use of agar.
Answer:
(a) Gelidium Gracilaria
(b)

1. Use to grow microbes
2. Preparations of ice-creams and jellies.

Question 20.
Differentiate endarch and exarch xylem.
Answer:
In Endarch condition, protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery of the organ. eg. stem. In Exarch condition, protoxylem lies towards periphery and metaxylem lies towards the centre. eg. root.

Question 21.
Observe the figure. Identify the types to vascular bundles.

Answer:
(a) Radial
(b) Conjoint open

Question 22.
Differentiate between Heartwood and sapwood.
Answer:
The central dark coloured, durable and non functional wood is heart wood.
The peripheral light coloured, less durable and functional wood is sap wood.

Question 23.
Name the products obtained from anaerobic respiration by Yeast.
Answer:
Ethanol and CO₂

Question 24.
The girue below shows three types of facilitated diffusion. Identify the type of movement seen in (a) and (b).

Answer:
(a) Antiport
(b) Symport

Answer any 3 questions from 25 to 30. Each carries 3 scores. (3 × 3 = 9)

Question 25.
What are the fifferences between aerobic respiration and anaerobic respiration?
Answer:
In aerobic respiration glucose is breakdown in the presence of oxygen to produce carbon dioxide and water and more amount of energy.
In anaerobic respiration glucose is breakdown in the absence of oxygen to produce carbon dioxide, lactic acid, and ethanol (depends on type of micro-organism) and less amount of energy.

Question 26.
Given below is the floral formula of a plant in a particular family.

(a) Identify the family.
(b) Write any two floral characters of the family
Answer:
(a) Fabaceae
(b) Zygomorphic, 5 petals papilionaceous, vexillary aestivation diadelphous stamen and marginal placentation (any two)

Question 27.
The figure shown below is the diagrammatic view of an important phase of mitosis.
(a) Identify the phase.
(b) What are the key events occurring during this phase?
Answer:

(a) Metaphase
(b) Spindle fibres attach to kinetochores of chromosomes.
Chromosomes are arranged at spindle equator.

Question 28.
What are the criteria used for identifying essentiality of elements?
Answer:
(a) The element must be supporting normal growth and reproduction.
(b) The requriement of the element must be specific.
(c) The element must be directly involved in the metabolism of the plant.

Question 29.
The respiratory quotient depends upon the type of substrate used during respiration.
(a) Define RQ (Respiratory quotient)
(b) What is the RQ of carbohydrte during respiration?
Answer:
(a) The ratio of the volume of CO₂ evolved to the volume of O₂ consumed in respiration is called the respiratory quotient.
(b) 1

Question 30.
The various functions of plant growth regulaters are given below. Arrange them under suitable columns in the table provided.(i) Intermode elongation of sugarcane
(ii) Promotes cell division
(iii) Bolting
(iv) Apical dominance
(v) Initiate rooting in stem cutting
(vi) Overcome apical dominance

Name of Plant growth regulators	Function
Auxin
Giberelline
Cytokinin

Answer:

Name of Plant growth regulators	Functions
Auxin	(a) Apical dominance
	(b) Initiate rooting in stem cutting
Giberelline	(c) Intermode elongation of sugarcane
	(d) Bolting
Cytokinin	(e) Promotes cell division
	(f) Overcome apical