Which of the following statements is not correct w.r.t. earthworm ?

Options

A. One pair of testes in segment 9
B. One pair of ovaries in segment 13
C. Protandrous condition
D. Cross-fertilization

Answer

To determine which statement is not correct with respect to earthworms, we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Statement 1: One pair of testes in segment 9.**
- This statement is incorrect. Earthworms actually have **two pairs of testes**, which are located in segments **10 and 11**. Therefore, this statement does not accurately describe the reproductive anatomy of earthworms.

2. **Statement 2: One pair of ovaries in segment 13.**
- This statement is correct. Earthworms possess **one pair of ovaries**, and they are indeed located in segment **13**. This accurately reflects the reproductive structure of earthworms.

3. **Statement 3: Protandrous condition.**
- This statement is also correct. In earthworms, the male gametes mature first, which is known as the **protandrous condition**. This means that the male reproductive organs are functional before the female ones.

4. **Statement 4: Cross fertilization.**
- This statement is correct as well. Earthworms engage in **cross fertilization**, where the male gametes from one earthworm fertilize the female gametes of another. This is due to the timing of gamete maturity, where male gametes mature before female gametes.

### Conclusion:
The statement that is **not correct** with respect to earthworms is: **"One pair of testes in segment 9."**