Pharyngeal nephridia of Earthworm pheretima occur in segments

Options

A. 3, 4 and 5
B. 4, 5 and 6
C. 5, 6 and 7
D. 6, 7 and 8

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Earthworm Nephridia:**
- Earthworms have a specialized excretory system that includes nephridia. Nephridia are the excretory organs that help in the removal of waste products from the body.

2. **Identifying Pharyngeal Nephridia:**
- In the case of the Earthworm Pheretima, the pharyngeal nephridia are a specific type of nephridia located in the anterior region of the body.

3. **Locating the Segments:**
- The pharyngeal nephridia are found in three paired tufts. These tufts are located in specific segments of the earthworm's body.

4. **Determining the Specific Segments:**
- According to the information, the pharyngeal nephridia occur in segments 4, 5, and 6. This means that the correct segments where these nephridia are located are the fourth, fifth, and sixth segments.

5. **Conclusion:**
- Therefore, the answer to the question is that the pharyngeal nephridia of Earthworm Pheretima occur in segments 4, 5, and 6.

**Final Answer:**
The pharyngeal nephridia of Earthworm Pheretima occur in segments 4, 5, and 6.

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