A: During copulation, two earthworms mutually exchange sperms.
R: the sperms are stored temporarily in the spermathecae.

Options

A. IF both assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both assertion & reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. If assertion is true statement but reason is false, then mark (3).
D. If both assertion and reason are false statements, then mark (4).

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion (A)**: The assertion states that during copulation, two earthworms mutually exchange sperms.
- Earthworms are hermaphrodites, meaning they possess both male and female reproductive organs. During copulation, they align themselves ventrally and exchange sperm with each other.

2. **Understanding the Reason (R)**: The reason states that the sperms are stored temporarily in the spermathecae.
- The spermathecae are specialized structures in earthworms that serve as storage for the sperm received from another earthworm during copulation. This allows the earthworm to use the stored sperm for fertilization at a later time.

3. **Evaluating the Truth of A and R**:
- Both the assertion and the reason are true statements. The mutual exchange of sperm during copulation is a characteristic behavior of earthworms, and the function of the spermathecae is indeed to store sperm temporarily.

4. **Determining the Relationship Between A and R**:
- While both statements are true, the reason (R) does not directly explain the assertion (A). The assertion describes the process of sperm exchange, while the reason describes the storage of sperm, which is a separate aspect of the reproductive process.

5. **Conclusion**:
- Since both the assertion and reason are true but the reason does not explain the assertion, the correct answer is that both statements are true, but the reason is not the correct explanation of the assertion.

**Final Answer**: Both A and R are true, but R is not the correct explanation of A.

---