Assertion. In monocot stem, vascular bundle are arrangement in a ring.
Reason. Stele is of dictyostele type.

Options

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

Answer

To solve the question regarding the assertion and reason about the vascular bundles in monocot stems, we can break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that in monocot stems, vascular bundles are arranged in a ring.
- In reality, monocot stems have vascular bundles that are scattered throughout the stem rather than arranged in a ring. This is a characteristic feature of monocots.

2. **Understanding the Reason**:
- The reason provided is that the stele is of the dictyostele type.
- However, monocot stems typically exhibit an atactostele type of arrangement, not dictyostele. Dictyostele is more commonly associated with certain types of dicot plants.

3. **Evaluating the Assertion and Reason**:
- Since the assertion about the arrangement of vascular bundles in monocot stems is incorrect, and the reason about the type of stele is also incorrect, both statements are false.

4. **Conclusion**:
- Therefore, both the assertion and the reason are false. The correct answer to the question is that both the assertion and reason are incorrect.

### Final Answer:
Both the assertion and reason are false.

---