Respiratory pigment in Pheretima is present in

Options

A. Erythrocytes
B. Plasma
C. Yellow cells
D. Mucocytes

Answer

To answer the question about where the respiratory pigment in Pheretima (the scientific name for the earthworm) is present, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**:
- Pheretima is the scientific name for the earthworm, which belongs to the phylum Annelida.

2. **Understand the Mode of Respiration**:
- Earthworms primarily respire through their skin. This process is known as cutaneous respiration.

3. **Determine the Respiratory Pigment**:
- The main respiratory pigment in earthworms is hemoglobin.

4. **Location of Hemoglobin**:
- Unlike vertebrates, where hemoglobin is contained within red blood cells (erythrocytes), in earthworms, hemoglobin is dissolved in the blood plasma.

5. **Evaluate the Options**:
- The options given are:
- A) Erythrocytes
- B) Plasma
- C) Yellow cells
- D) Mucocytes
- Since earthworms do not have erythrocytes, this option is incorrect.
- The correct answer is plasma, as hemoglobin is dissolved in the blood plasma, making this option correct.
- Yellow cells and mucocytes are involved in other functions (excretion and mucus production, respectively) and are not related to respiration.

6. **Conclusion**:
- Therefore, the respiratory pigment in Pheretima (earthworm) is present in the plasma.

### Final Answer:
The respiratory pigment in Pheretima is present in **plasma**.

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