Asertion :- Cleistogamy is disadvantageous for plants.
Reason:- Cleistogamous flowers do not opens so sex organs do not receive sufficient light,which is essential for maturation of gametes.

Options

A. A
B. B
C. C
D. D

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that "Cleistogamy is disadvantageous for plants."
- Cleistogamy refers to a type of reproduction where flowers remain closed and self-pollinate without the need for external pollinators.

2. **Evaluating the Assertion:**
- Cleistogamous flowers have advantages such as ensuring self-pollination and not relying on pollinators, which can be beneficial in unfavorable conditions.
- While there is a lack of genetic diversity due to self-pollination, this does not make cleistogamy inherently disadvantageous. Thus, the assertion is incorrect.

3. **Understanding the Reason:**
- The reason given is that "Cleistogamous flowers do not open, so sex organs do not receive sufficient light, which is essential for maturation of gametes."
- This statement suggests that light is necessary for the maturation of gametes in cleistogamous flowers.

4. **Evaluating the Reason:**
- In reality, the maturation of gametes in cleistogamous flowers occurs through self-pollination, and they do not require light for this process.
- Light is primarily important for photosynthesis in leaves and stems, not for the maturation of gametes in closed flowers. Therefore, this reason is also incorrect.

5. **Conclusion:**
- Since both the assertion and the reason are incorrect, the final answer is that the assertion is wrong and the reason is also wrong.