Number of earthworm formed in each cocoon on an average? 

Options

A. 1
B. 2
C. 4
D. many

Answer

To determine the average number of earthworms formed in each cocoon, we can follow these steps:

1. **Understand the Reproductive Process**: Earthworms reproduce through a process called copulation, where mature sperm and egg cells are involved.

2. **Identify the Structure Involved**: The cocoon is produced by a gland called the clitellum, which is a thick, glandular, non-segmented section of the earthworm's body located near the head.

3. **Fertilization and Development**: Inside the cocoon, fertilization occurs, and the development of the embryos takes place. The cocoon is then deposited in the soil.

4. **Determine the Average Number of Offspring**: After a period of about three weeks, each cocoon can yield between 2 to 20 baby earthworms.

5. **Calculate the Average**: To find the average, we can take the range of 2 to 20. The average number of earthworms per cocoon can be calculated as follows:
- Minimum: 2
- Maximum: 20
- Average = (Minimum + Maximum) / 2 = (2 + 20) / 2 = 11 (This is the average range, but we need to focus on the average number mentioned in the video).

6. **Final Conclusion**: According to the video, the average number of earthworms formed in each cocoon is around 4.

Thus, the answer to the question is **4**.

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