Fertilization in Pheretima posthuma occurs in

Options

A. spermathecae
B. cocoon
C. coelom
D. seminal vesicles.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where fertilization occurs in Pheretima posthuma, which is the scientific name for the earthworm.

2. **Defining Fertilization**: Fertilization is the process of fusion between male and female gametes, which in the case of earthworms are sperm and ova.

3. **Identifying the Options**: The options given are:
- Spermathecae
- Cocoon
- Coelom
- Seminal vesicles

4. **Analyzing Each Option**:
- **Spermathecae**: These are structures in earthworms that store sperm but do not serve as the site of fertilization.
- **Cocoon**: This is a protective structure produced by earthworms where fertilization occurs. Mature sperm and ova are deposited here, and fertilization takes place.
- **Coelom**: This is the body cavity in earthworms, but it is not the site of fertilization.
- **Seminal Vesicles**: These store sperm but are not involved in the fertilization process.

5. **Conclusion**: Based on the analysis, the correct answer is that fertilization in Pheretima posthuma occurs in the cocoon.

**Final Answer**: Fertilization in Pheretima posthuma occurs in the cocoon.

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