Teachers recommend solving Kerala Syllabus Plus Two Botany Previous Year Question Papers and Answers Pdf March 2022 to improve time management during exams.
Kerala Plus Two Botany Previous Year Question Paper March 2022
Part – I
A. Answer any 3 questions from 1 to 4. Each carries 1 score.
Choose the correct answer:
Question 1.
Innermost wall layer of Micro-sporangium is
(a) Middle layer
(b) Epidermis
(c) Tapetum
(d) Endothecium
Answer:
Tapetum
Question 2.
Fill in the blank.
The first restriction endonuclease enzyme isolated is ______ .
Answer:
Hindu
Question 3.
In polar seas, seals have a thick layer of fat. Name the fat layer seen below their skin.
Answer:
Blubber
Question 4.
Choose the correct answer:
The green plants in the ecosystem are the chief
(a) Decomposers
(c) Producers
(b) Consumers
(d) Herbivores
Answer:
Producers
B. Answer all questions from 5 to 6. Each carries 1 score.
Question 5.
Fill in the blank.
The time period from birth to the natural death of an organism is known as _____.
Answer:
Life span
Question 6.
Expand ELISA
Answer:
Enzyme Linked Immuno-sorbent Assay
Part-II
A. Answer any two questions from 7 to 9. Each carries 2 scores.
Question 7.
What are the four main objectives of Bio-fortification?
Answer:
- Increased protein content and quality.
- Increased oil content and quality
- Increased vitamin content
- Increased micronutrient and mineral content
Question 8.
Mention the functions of GEAC (Genetic Engineering Approval Committee)
Answer:
They take decisions regarding the validity of GM research and safety of introducing GM-organisms for public services.
Question 9.
Fill in the blanks with suitable terms:
| Asexual Reproduction | |
| Asexual Reproductive Structure | Examples |
| Zoospores | (a) |
| (b) | Penicillium |
| (c) | Hydra |
| Gemmules | (d) |
Answer:
| Asexual Reproductive Structures | Examples |
| Zoospoores | Chiamydomonas |
| Conidia | Penicillium |
| Buds | Hydra |
| Gemmules | Sponges |
B. Answer any two questions from 10 to 13. Each carries 2 scores.
Question 10.
Comment on Self-incompatibility.
Answer:
Pollen from the same flower does not germinate in the stigma. This genetic mechanism helps to prevent self polination. Pollen from the same flower does not germinate in the stigma. This genetic mechanism helps to prevent self polination.
Question 11.
Introduction of semi-dwarf varieties increased production of rice and wheat. Complete the table with the names of any two semi-dwarf varieties of wheat and rice.
| Rice | Wheat |
| – | – |
| – | – |
Answer:
(i) Wheat – Sonalika and Kalyan Sona.
(ii) Rice – Jaya and Ratna
Question 12.
Fill in the blanks.
| Population Interaction | ||
| Species – A | Species – B | Name of Interaction |
| (a) _____ | (b) | Competition |
| (c) _____ | _____ | Predation |
| _____ | 0 | (d) ______ |
Answer:
Question 13.
Name the type of succession that occurs in wet area. What is the climax community in that succession?
Answer:
Hydrarch
Climax community – Forest
Part -III
A. Answer any three questions from 14 to 17. Each carries 3 scores.
Question 14.
Explain the method of genetically engineered human insulin production by ‘Eli Lilly’ in 1983.
Answer:
Eli Lilly Company prepared DNA sequences corresponding to A and B chain of insulin. A and B Chain’DNA were introduced into plasmids of E. coil to produce the Apoly peptide and B poly peptide chains, Chain A and B were extracted and combined by creating disulphide bonds.
Question 15.
List out some of the adaptations seen in desert plants.
Answer:
- They have a thick cuticle
- Leaf reduced to spine
- Sunken stomata to minimize water loss through transpiration.
Question 16.
What are the consequences of deforestation?
Answer:
- Increased carbon dioxide concentration
- Loss of Biodiversity.
- Disturbs hydrologic Cycle.
- Soil erosion.
Question 17.
The figure shows the pyramid of energy. Pyramid of energy is always upright. Why?
Answer:
When energy flows from one trophic level to the next level, some energy is lost as heat at each step a 10%.
B. Answer the following question. Carries 3 scores. (1 × 3 = 3)
Question 18.
CNG is widely used in vehicles in Delhi.
(a) Expand CNG.
(b) What are the advantages of using CNG than Diesel?
Answer:
(a) Compressed Natural Gas
(b) It burns efficiently
- It is cheaper than petrol or diesel
- It cannot be siphoned off by thieves.
- It cannot be adultered like petrol or diesel.
Part – IV
Answer any one question from 19 to 20. Carries 5 scores. (1 × 5 = 5)
Question 19.
Pollination is an important mechanism found in flowering plants.
(a) Define pollination
(b) Write short note on:
(1) Autogamy
(2) Geitonogamy
(3) Xenogamy
Answer:
(a) Transfer of pollen grains from the anther to the stigma of a pistil is termed as pollination.
(b)
- Autogamy – Transfer of pollen grain from the anther to the stigma of the same flower.
- Geitonogamy – The transfer of pollen grains from the anther to the stigma of different flowers of the same plant
- Xenogamy – The transfer of pollen grains from the anther to the stigma of different plants of the same species.
Question 20.
Restriction enzymes are widely used in Biotechnolgoy.
(a) Name two kinds of restriction enzymes.
(b) Explain the naming procedure of restriction enzymes with one example.
Answer:
(a) Exonucleases & Endonucleases
(b) Eg:EcoRI – derivedfromEsche,ichiacoliRYl3
E – Genus (Escherichia)
co – Species (coli)
R – strain of bacteria
I – order in which enzyme is Isolated.