Assertion: Dichogamy refers to maturation of male and female sex organs at different times.
Reason: This is a safeguard against crosspollination.

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Dichogamy refers to maturation of male and female sex organs at different times."
- This is indeed true. In plants exhibiting dichogamy, the stamens (male reproductive organs) and pistils (female reproductive organs) mature at different times, preventing self-pollination.

2. **Understanding the Reason**:
- The reason states that "This is a safeguard against cross-pollination."
- This statement is misleading. While dichogamy does prevent self-pollination, it does not serve as a safeguard against cross-pollination. In fact, it promotes cross-pollination by ensuring that the male and female parts are not mature simultaneously.

3. **Evaluating the Relationship**:
- Since the assertion is true and accurately describes dichogamy, but the reason is false because it misrepresents the purpose of dichogamy, we conclude that the assertion stands correct while the reason does not.

4. **Final Conclusion**:
- Therefore, the correct answer is that the assertion is true, but the reason is false.