Assertion : In opposite phyllotaxy two leaves are borne on the opposite sides of a single node
Reason : Opposite phyllotaxy is seen in China rose and Oleander.

Options

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

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "In opposite phyllotaxy, two leaves are borne on the opposite sides of a single node."
- This is a correct statement. In opposite phyllotaxy, indeed, two leaves arise from the same node but on opposite sides.

2. **Understanding the Reason**:
- The reason given is "Opposite phyllotaxy is seen in China rose and Oleander."
- This statement is incorrect. China rose (Hibiscus rosa-sinensis) typically exhibits alternate phyllotaxy, where leaves are arranged alternately on the stem, and Oleander (Nerium oleander) also exhibits whorled phyllotaxy, where multiple leaves are present at a single node.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we conclude that the correct answer is that the assertion is true but the reason is false.

### Final Answer:
- The assertion is true, and the reason is false.