Gustoreceptors of Pheretima are present

Options

A. In the buccal cavity
B. In the prostomium
C. In the peristomium
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understand the Question**: The question is asking where the gustoreceptors (taste receptors) of the earthworm (Pheretima) are located.

2. **Identify the Organism**: Recognize that Pheretima refers to a genus of earthworms, which belong to the phylum Annelida.

3. **Locate Gustoreceptors**: Gustoreceptors in earthworms are specialized cells that help in tasting and smelling.

4. **Identify the Specific Location**: According to the information, these gustoreceptors are found in the buccal cavity of the earthworm.

5. **Describe the Structure**: The gustoreceptor cells in the buccal cavity contain sensory hair-like processes, and their nuclei are located below the middle part of the cell.

6. **Function of Gustoreceptors**: These receptors serve dual functions, acting as both olfactory (smell) and gustatory (taste) receptors, allowing the earthworm to detect decaying food in its environment.

7. **Evaluate Other Options**: The other options provided (prostomium and peristomeum) refer to different parts of the earthworm and do not contain gustoreceptors.

8. **Conclusion**: The correct answer to the question is that the gustoreceptors of Pheretima are present in the buccal cavity.

**Final Answer**: The gustoreceptors of Pheretima are present in the buccal cavity.

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