Egg case in earthworms is formed by the secretion of a material which is secreted from

Options

A. Peristomium
B. Prostomium
C. Clitellar region
D. Post-clitellar region

Explanation

To answer the question regarding where the egg case in earthworms is formed, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The egg case in earthworms is associated with a specific structure known as the clitellum.

2. **Location of the Clitellum**: The clitellum is a thickened, glandular band that is typically found in segments 14 to 16 of mature earthworms.

3. **Function of the Clitellum**: The primary function of the clitellum is to secrete mucus and other materials that form the egg case or cocoon for the fertilized eggs.

4. **Material Secreted**: The secretion from the clitellum includes mucous and albumin, which help in forming a protective casing for the eggs.

5. **Conclusion**: Therefore, the egg case in earthworms is formed by the secretion of materials from the clitellum, located in the clitellar region of the earthworm.

### Final Answer:
The egg case in earthworms is formed by the secretion of a material which is secreted from the **clitellar region**.

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