Kerala Plus One Botany Board Model Paper 2022 with Answers

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf Board Model Paper 2022 to improve time management during exams.

Kerala Plus One Botany Board Model Paper 2022 with Answers

Answer any three questions from 1 to 4. Each carries 1 score. (3 × 1 = 3)

Question 1.
Fill in the blank.
Reserve food of rhodophyceae is ____
Answer:
Floridean starch

Question 2.
Choose the correct answer.
Water loss in its liquid phase from the tip of grass blades is
(a) Guttation
(b) Osmosis
(c) Transpiration
(d) lmbibition
Answer:
A) Guttation

Question 3.
Name the special type of anatomy present in C₄ plants.
Answer:
Kranz anatomy

Question 4.
Fill in the blank.
The process of breakdown of glucose to pyruvic acid is called
Answer:
Glycolysis

II. Answer any 9 questions from 5 to 17. Each carries 2 scores. (9 × 2 = 18)

Question 5.
Write any two factors for seed dormancy.
Answer:

1. Impermeable and hard seed coat
2. Immature embryo

Question 6.
List out any four external factors affecting photo-synthesis.
Answer:
Light, CO₂ concentration, Temperature, Water.

Question 7.
Explain the significance of mitosis.
Answer:

1. It results in the production of diploid daughter cells with identical genetic constitution.
2. The growth of multicellular organisms.

Question 8.
What is measosome? Mention any two functions of mesosome.
Answer:
(a) Mesosomes are special membranous structure of bacteria which is formed by the extension of plasma membrane in to the cell.

1. They help in cell wall formation.
2. DNA replication and distribution to daughter cells.

Question 9.
Observe the figure of citric acid cycle given below. Identify (a), (b), (c) and (d) in the figure.

Answer:
A – citric acid,
B – alpha ketoglutaric acid,
C – succinic acid,
D – oxaloacetic acid

Question 10.
Name the four different compnents of phloem in angiosperms.
Answer:

1. Sieve tube
2. Companion cell
3. Phloem paraenchyma
4. Pholem fibre

Question 11.
Observe the figure of cell cycle given below.
a) Name the two phases of cell cycle.
b) Identify the stages (a) and (b) of the cell cycle.

Answer:
a) Interphase and M phase
b) (a) G1 phase,
(b) G2 phase

Question 12.
Differentiate Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).
Answer:
RER – Rough endoplasmic reticulum with ribosomes on their surface. It is Involved in protein synthesis and secretion.
SER – Smooth endoplasmic reticulum devoid of ribosomes on their surface. It is involved in lipid synthesis.

Question 13.
What are bulli forms cells? Mention their function.
Answer:
In grasses, certain adaxial epidermal cells are large,empty,colourless cells.These are called bulliform cells. Due to water stress, they make the leaves curl inwards to minimise water loss.

Question 14.
Observe the figure and label the parts (a), (b) and (c). Write down the functions of root hairs.

Answer:
a) Region of Maturation
b) Region of Elongation
c) Region of Meristematic
Function – Absorption of water and minerals

Question 15.
Match the following.

Volvox	Bryophyte
Pinus	Algae
Salvinia	Gym nosperm
Marchantia	Pteridophyte

Answer:

Volvox	Algae
Pinus	Gymnosperm
Salvinia	Pteridophyte
Marchantia	Bryophyte

Question 16.
Define diatomaceous earth. Mention anyone use of diatomaceous earth.
Answer:
Dead remains of diatoms are known as ‘diatomaceous earth’. Used in polishing and filtration of oils and syrups.

Question 17.
Observe the figure and identify (1) and (2)

Answer:

1. Antiport
2. Symport

Answer any 3 questions from 18 to 22. Each carried 2 scores. (3 × 3 = 9)

Question 18.
Define phyllotaxy. Explain any two types of phyllotaxy.
Answer:
It is the mode of arrangement of leaves on the stem or branch.

1. Alternate – A single leaf at each node
2. Opposite – A pair of leaves at each node

Question 19.
Expalin the differnt steps involved in the formation of a root nodule in leguminous plants.
Answer:
(a) Rhizobium attaches root hair,
(b) Root hair curls
(c) Infected thread carries the bacteria to the inner cortex.
(d) The bacteria get modified into rod-shaped bacteroids and cause inner cortical and pericycle cells to divide.
(e) A mature nodule is complete with vascular tissues continuous with those of the root.

Question 20.
Give any three differences between aerobic respiration and fermentation.
Answer:

Aerobic respiration	Fermentation
Complete oxidation	Incomplete oxidation
Takes place in the presence of oxygen	Takes place in the absence of oxygen
Large amount of energy is released	Less amount of energy is released

Question 21.
The functions of different Plant Growth Regulators (PGR) are given.
Arrange them into respective columns.
• apical dominance
• bolting
• delay leaf senescence
• rooting of stem cutting
• overcome apical dominance

Auxin	Gibberellin	Cytokinin

Answer:

Auxin	Gibberellin	Cytokinin
Apical dominance	Bolting	Delay leaf senescence
Rooting of stem cutting	Increases the length of the stem	Overcome apical dominance

Question 22.
Observe the given diagram of LHC

a) Name the pigmenf that forms the reaction center.
b) Name any one accessory pigment involved in photosynthesis.
c) Mention the function of accessory pigment.
Answer:
a) Chlorophyll a

b) Chlorophyll b’or: Xanthophylls

c) • Absorb light and transfer the energy to chlorophyll a.
• It helps to protect chlorophyll a form photo oxidation.