In Earthworm fertilization occurs in

Options

A. Oviduct
B. Spermatheca
C. Clitellum
D. Cocoon

Answer

**Step-by-Step Solution:**

1. **Understanding Earthworm Reproduction**: Earthworms reproduce sexually and have both male and female reproductive organs. They are hermaphrodites, meaning each individual has both sets of reproductive organs.

2. **Fertilization Process**: In earthworms, fertilization occurs externally. This means that the sperm and eggs unite outside the body of the earthworm.

3. **Role of the Clitellum**: The clitellum is a thickened, glandular section of the earthworm's body that plays a crucial role in reproduction. It secretes a mucus ring that helps in the formation of the cocoon.

4. **Formation of the Cocoon**: After mating, the earthworm secretes a slime tube from the clitellum, which forms a protective cocoon around the fertilized eggs. This cocoon is where the fertilization occurs.

5. **Development of Offspring**: The cocoon, which contains the fertilized eggs, is deposited in the soil. The eggs develop within the cocoon, and the young earthworms hatch after a period of 30 to 60 days, although some cocoons can remain dormant for years.

6. **Conclusion**: Therefore, the correct answer to the question "In Earthworm fertilization occurs in" is the cocoon.

**Final Answer**: Fertilization in earthworms occurs in the cocoon.

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