Assertion (A): Double fertilisation is unique to angiosperms.
Reason ( R): Triple fusion occurs in asexual reproduction.

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is NOT the correct explanation of A.
C. A is true but R is false.
D. A is false and R is true.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion (A):**
- The assertion states that "Double fertilization is unique to angiosperms."
- Double fertilization is a process where one sperm fertilizes the egg to form the embryo, while the other sperm fuses with two polar nuclei to form the endosperm. This process is indeed unique to flowering plants (angiosperms).

2. **Understanding the Reason (R):**
- The reason states that "Triple fusion occurs in asexual reproduction."
- Triple fusion refers to the fusion of one sperm nucleus with two polar nuclei to form the triploid endosperm. This process is part of sexual reproduction, specifically within the context of double fertilization in angiosperms, and does not occur in asexual reproduction.

3. **Evaluating the Assertion and Reason:**
- Since double fertilization is a characteristic of angiosperms, the assertion is correct.
- However, the reason provided is incorrect because triple fusion is not a part of asexual reproduction; it is part of sexual reproduction.

4. **Conclusion:**
- Based on the evaluation, the assertion is correct, but the reason is incorrect. Therefore, the correct answer is option C: "Assertion is right but the reason given is wrong."