Coelomic fluid of Pheretima is

Options

A. Acidic
B. Watery
C. Oily
D. Alkaline

Answer

To determine the nature of the coelomic fluid of Pheretima (the genus of earthworms), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**:
- Pheretima is a genus of earthworms, which belong to the phylum Annelida.

2. **Understand Coelomic Fluid**:
- Coelomic fluid is the fluid found within the coelom (the body cavity) of these organisms. It plays a crucial role in various physiological functions.

3. **Components of Coelomic Fluid**:
- The coelomic fluid consists of a matrix, plasma, and coelomocytes. Coelomocytes are specialized cells that contribute to the immune response in earthworms.

4. **Determine the Nature of Coelomic Fluid**:
- The coelomic fluid of Pheretima is known to be alkaline in nature. This alkalinity is primarily due to the presence of coelomocytes and other components that help maintain the pH balance.

5. **Evaluate the Options**:
- Given the options:
1. Oxygenophosphorus acidic
2. Watery
3. Oily
4. Alkaline
- Based on the information, we can eliminate the first three options (acidic, watery, oily) as they do not accurately describe the coelomic fluid of Pheretima.

6. **Conclusion**:
- The correct answer is that the coelomic fluid of Pheretima is alkaline.

### Final Answer:
The coelomic fluid of Pheretima is **alkaline**.

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