Assertion: Endosperm is haploid in Gymnosperm.
Reason: In Cycas, stem is usually branched

Options

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

Answer

To analyze the assertion and reason provided in the question, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Endosperm is haploid in Gymnosperm."
- In gymnosperms, the endosperm is indeed haploid, as it develops from the haploid microspore before fertilization.

2. **Understanding the Reason**:
- The reason states that "In Cycas, stem is usually branched."
- Cycas is a type of gymnosperm, and it is true that its stem can be branched, but this characteristic does not directly relate to the endosperm being haploid.

3. **Evaluating the Relationship**:
- The assertion is true because the endosperm in gymnosperms is indeed haploid.
- The reason is also true, as Cycas does have branched stems; however, it does not provide a valid explanation for the assertion.

4. **Conclusion**:
- Since the assertion is true and the reason is true but does not explain the assertion, the correct relationship is that both statements are true, but the reason is not correct in explaining the assertion.

### Final Answer:
- The assertion is true, and the reason is true, but the reason does not explain the assertion.