Assertion : Staminal tube is present in Malvaceae.
Reason : It is due to monoadelphous condition.

Options

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

Answer

To solve the question regarding the assertion and reason about the presence of the staminal tube in the Malvaceae family and its relation to the monoadelphous condition, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that a staminal tube is present in the Malvaceae family.
- The Malvaceae family, also known as the Mallow family, includes plants like hibiscus (China rose), cotton, and okra.
- In these plants, the stamens (the male reproductive organs) are often fused together, forming a tube-like structure.

**Hint**: Look for examples of plants in the Malvaceae family to understand their floral structure.

2. **Understanding the Reason**:
- The reason given is that the presence of the staminal tube is due to the monoadelphous condition.
- Monoadelphous means that all the stamens are united together to form a single structure or tube.
- This condition is characteristic of many members of the Malvaceae family.

**Hint**: Recall the definition of monoadelphous and how it relates to the structure of stamens in flowering plants.

3. **Evaluating the Assertion and Reason**:
- Both the assertion and the reason are true. The presence of the staminal tube does occur in Malvaceae, and it is indeed due to the monoadelphous condition.
- The reason correctly explains why the assertion is true.

**Hint**: Consider how the structure of flowers can provide insight into their reproductive strategies.

4. **Conclusion**:
- Since both the assertion and reason are true, and the reason provides the correct explanation for the assertion, the answer is that both statements are correct, and the reason is the correct explanation of the assertion.

**Hint**: When answering assertion-reason questions, always check if the reason logically supports the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.