Section B: Short Answer Questions (2 marks each)
Question 17: A diagram depicts the stages of meiosis in an animal cell.
- (a) Identify the stage represented in the diagram.
- (b) Explain the significance of this stage in genetic diversity.
Question 18: Consider the following scenario in an ecosystem: A species of plants in a forest area has developed resistance to a widespread pathogenic fungus.
- (a) Explain the possible genetic basis of this resistance.
- (b) Discuss how this resistance could affect the ecosystem’s biodiversity.
Question 19: Describe the process of RNA interference (RNAi).
- (a) Explain the role of RNAi in gene regulation.
- (b) Give one example of its application in biotechnology.
Question 20: A graph shows the fluctuation of two hormones (A and B) during the menstrual cycle.
- (a) Name the hormones represented as A and B.
- (b) Describe the effects of hormone B on the endometrium.
Question 21: Refer to the given diagram of a food web in a freshwater ecosystem.
- (a) Identify the primary producers.
- (b) Explain the role of decomposers in this ecosystem.
Class 12 Biology Sample Paper 2023-24
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