Assertion: Protandry is a condition in which anthers mature earlier than stigma.
Reason: Cleistogamous flowers are bisexual and never open.

Options

A. If both Assertion and Reason are true and Reason is corret explanation of Assertion
B. If both Assertion and Reason are true and Reason is not corret explanation of Assertion
C. If Assertion is true but Reason is false
D. If both Assertion and Reason are false

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Protandry is a condition in which anthers mature earlier than stigma."
- This definition is correct. Protandry is indeed a phenomenon where the male reproductive organs (anthers) mature before the female reproductive organs (stigma), which helps in preventing self-pollination.

2. **Understanding the Reason**:
- The reason states that "Cleistogamous flowers are bisexual and never open."
- This statement is also correct. Cleistogamous flowers are indeed bisexual, meaning they have both male and female reproductive parts, and they do not open, which prevents cross-pollination.

3. **Analyzing the Relationship**:
- The assertion and reason are both true, but the reason does not explain the assertion.
- Protandry is a mechanism to avoid self-pollination, while cleistogamous flowers facilitate self-pollination by remaining closed. Therefore, the reason provided does not serve as an explanation for the assertion.

4. **Conclusion**:
- Since both the assertion and the reason are true, but the reason does not explain the assertion, the correct answer is: "Both assertion and reason are true, and the reason is not a correct explanation of the assertion."

### Final Answer:
- The correct option is: **Both assertion and reason are true, and reason is not a correct explanation of assertion.**

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