Kerala Plus One Botany Board Model Paper 2021 with Answers

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

Kerala Plus One Botany Board Model Paper 2021 with Answers

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

Question 1.
Fill imthe blank :
Network of hyphae in fungi is called .
Answer:
Mycelium

Question 2.
Name the plant hormone known as ‘Stress hormone’,
Answer:
Abscissic acid (ABA)

Question 3.
Choose the correct Answer from the bracket: AIDS in human being is caused by ______.
(a) Bacterium
(b) Fungus
(c) Virus
(d) Mycoplasma
Answer:
c) Virus

Question 4.
Fill in the blank:
Exchange of genetic materials between homologous chromosomes during Pachytene stage of Meiosis-I is called.
Answer:
Crossing over

Question 5.
Name the Pigment that gives pink colour to root nodules of Leguminous plants.
Answer:
Leghaemoglobin

Question 6.
Fill in the blank :
In Rhizophora certain roots grow vertically for breathing. Such roots are called ____ .
Answer:
Pneumatophores

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

Question 7.
Complete the table with appropriate terms:
Classes
Chlorophyceae
(c)
Rhodophyceae

Common Name
(a)
Brown algae
Red algae

Major Pigments
Chlorophyll a,b
Chlorophyll a, c Fucoxanthin
Chlorophyll a, d (d)

Stored Food
(b)
Manitol Laminarin
Floredean starch
Answer:
(a) Green algae
(b) Starch
(c) Phaeophyceae
(d) Phycoerythrin

Question 8.
Write any two anatomical differences between stem and Root of Angiosperms.
Answer:
Stem
(a) Xylem is endarch
(b) Trichome is present Root
(a) Xylem is exarch
(b) Root hair is present

Question 9.
Write the difference between spring wood and autumn wood.
Answer:

1. Spring wood
   • Cambium is more active
   • Large quantity of xylem vessels are formed.
2. Autumn wood
   • Cambium is less active
   • Fewer quantity of xylem vessels are formed.

Question 10.
(a) Which plants are known as ‘Amphibians of the plant kingdom’ ?
(b) Give reason.
Answer:
a) Bryophytes
b) They are found in moist, cool and shaded localities and they require water for sexual reproduction.

Question 11.
Xylem is a conducting tissue seen in higher plants. Write the names of four elements of Xylem.
Answer:

1. Trachieds
2. Vessels
3. Xylem fibre
4. Xylem parenchyma

Question 12.
Phyllotaxy is the pattern of arrangement of leaves on stem of branch. Write the name of any two types of Phyllotaxy.
Answer:

1. Alternate phyllotaxy
2. Opposite phyllotaxy

Question 13.
(a) What is the name of the model of Plasma membrane proposed by Singer and Nicolson.
(b) Write any one function of Plasma membrane.
Answer:
a) Fluid mosaic model
b) It helps in the transport of solvent molecules.

Question 14.
(a) Define imbibition.
(b) Write one benefit of imbibition to plants.
Answer:
a) It is a kind of diffusion in which certain hydrophilic colloid molecules absorb water without forming solution.
b) It helps in the germination of seeds.

Question 15.
(a) Write the name of the stage of Mitosis in the given figure.
(b) Write one main event occurring in this stage.

Answer:
a) Anaphase
b) Chromosome move towards opposite poles of the cell

Question 16.
Write any two purposes of transpiration.
Answer:

1. It provides cooling effect
2. It helps in the absorption of water and Minerals.

Question 17.
Write any two differences between Cyclic and Non – cyclic photophosphorylation.
Answer:

Cyclic	Non cyclic
ATP produced	ATP & NADPH are produced
PSI involved	PSI and PS II are involved

Question 18.
(a) Identify and write the name of cell organelle given in the figure.
(b) Label the parts marked as A, B.

Answer:
a) Mitochondria
b) A – Matrix
B – Cristae

Question 19.
(a) Write the name of two phases of Photosynthesis.
Answer:
a) Light reaction and Dark reaction
b) Light reaction occur in Grana
Dark reaction occur in Stroma

Question 20.
(a) Write the name of the growth curve seen in the given figure.
(b) Write the name of phases marked as A and B.

Answer:
a) Sigmoid curve
b) A – Lag phase
B – Stationary phase

Question 21.
Match the following :

Cell organelle	Function
Lysosomes	Lipid Synthesis
Golgi apparatus	Store excretory products
Endoplasmic reticulum	Store hydrolytic enzymes
Vacuoles	Packaging of materials

(b) Which are the sites of these phases in chloroplast ?
Answer:
Lysosome – Store hydrolytic enzymes
Golgi apparatus – Packaging of materials
Endoplasmic reticulum – Lipid synthesis
Vacoules – Store excretory products

Question 22.
(a) What is fermentation?
(b) Which are the main products produced as a result of fermentation in (i) Yeast, (ii) Muscles?
Answer:
a) It is the anaerobic respiration that takes place in the presence of micro organism and give products.
b) Yeast – Ethyl alcohol and C02 Muscle – Lactic acid

Question 23.
Observe the figure of Calvin cycle given below:
(a) Write the name of three major events marked as A, B and C.
(b) Find out the name of first C02 acceptor given in the figure.

Answer:
a) A – Carboxylation
B – Reduction
C – Regeneration
b) RuBP

Question 24.
(a) What is ‘Kranz’ anatomy ?
(b) Write two examples of plants that exhibit ‘Kranz’ anatomy.
Answer:
a) In C₄ plants bundle sheath chloroplast are centripetally in arranged ring shape such a leaf anatomy is called Kranz anaotmy.
b) Sugarcane, Maize

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

Question 25.
Flowers are classified into three types based on the position of floral parts on thalamus.
(a) Which are they ?
(b) Write the position of ovary in each one of them.
Answer:
a) Hypogynous
Perigynous
Epigynous

b) Hypogynous – ovary Superior Perigynous – ovary half inferior Epigynous – ovary inferior

Question 26.
(a) What is Respiratory Quotient (RQ)?
(b) Write the RQ of (i) Carbohydrate, (ii) Fat.
Answer:
a) It is the ratio of volume of C02 evolved to the volumeof oxygen consumed,
b) i) Carbohydrate 1 ii) Fat 0.7

Question 27.
The essentiality of an element to plants is determined by three criteria. Which are they?
(b) Write the site of this process in cell.
(c) Write the name of the end product of this process.
Answer:

1. It supports normal growth and reproduction.
2. Role of element must be specific.
3. Element is directly involved in metabolism.

Question 28.
(a) Name the process which is common for Aerobic and Anaerobic respiration.
(a) Write the name of plant hormone responsible for ripening of fruits.
(b) Write any two other functions of this hormone.
Answer:
a) Glycolysis
b) Cytoplasm
c) two molecules of Pyruvic acid

Question 29.
Observe the given figure of cell cycle
(a) Write the name of phases marked as A and BN A, B
(b) Write one important event in A and B.

Answer:
a) A – S phase
B – G2 phase

b) i) In S phase DNA replication occurs
ii) In G2 phase RNA and protein are produced and cell growth continues

Question 30.
(a) Write the name of plant hormone responsible for ripening of fruits.
(b) Write any two other functions of this hormone.
Answer:
a) Ethylene

b) It promote the production of female fowers in cucumbers. It promotes internodal elongation in deep water rice plants.