Which one of the following structures in Pheretima is correctly matched with its function ?

Options

A. Clitellum - Secretes cocoon
B. Gizzard - Absorbs digested food
C. Setae - Provides defence against predators
D. Typhlosole - Storage of extra nutrients

Explanation

To determine which structure in Pheretima (earthworm) is correctly matched with its function, we will analyze each option provided:

1. **Clitellum**: The clitellum is a specialized glandular structure in earthworms that secretes a cocoon during reproduction. This cocoon is essential for the fertilization process as it contains eggs and sperm. Thus, the clitellum is correctly matched with its function of secreting the cocoon.

2. **Gizzard**: The gizzard is a muscular part of the alimentary canal that is primarily responsible for grinding food. It does not absorb digested food; instead, it mechanically breaks down soil particles and decaying leaves. Therefore, this option is incorrectly matched.

3. **Setae**: Setae are small bristle-like structures on the body of the earthworm that aid in locomotion and help the worm attach to surfaces. They do not provide defense against predators, making this option incorrectly matched.

4. **Typhlosol**: The typhlosol is a fold in the intestinal wall that increases the surface area for absorption. It does not serve as a storage site for extra nutrients, which means this option is also incorrectly matched.

After analyzing all the options, we conclude that the correct match is:

**Correct Answer**: Clitellum secretes cocoon.