Assertion :- In calotrpis and guava opposite phyllotaxy is found.
Reason :-In calotropis and guava a pair of leaves arise on each node.

Options

A. If both Assertion & Reason are True & Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Assertion**: The assertion states that in Calotropis and Guava, opposite phyllotaxy is found. Phyllotaxy refers to the arrangement of leaves on the stem of a plant. In opposite phyllotaxy, two leaves arise from the same node but are positioned opposite each other.

2. **Understanding the Reason**: The reason provided states that in Calotropis and Guava, a pair of leaves arises on each node. This means that at each node of the stem, there are two leaves that emerge in opposite directions.

3. **Evaluating the Assertion**: The assertion is true because both Calotropis and Guava exhibit opposite phyllotaxy. This means that the leaves are arranged in pairs at each node, confirming the assertion.

4. **Evaluating the Reason**: The reason is also true. It accurately describes the phenomenon of opposite phyllotaxy, where a pair of leaves arises from each node in opposite directions.

5. **Conclusion**: Since both the assertion and the reason are true, and the reason correctly explains the assertion, the correct answer is that both assertion and reason are true, and the reason is a correct explanation of the assertion.

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

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