Erythrocytes of Pheretima contain

Options

A. Haemoglobin
B. Erythrocruorin
C. Haemocyanin
D. Erythrocytes are absent

Answer

**Step-by-Step Solution:**

1. **Identify the Organism:**
- The question refers to the erythrocytes of Pheretima, which is a genus of earthworms.

2. **Understand the Blood System:**
- Pheretima has a closed circulatory system, which includes blood vessels, capillaries, and hearts.

3. **Determine the Components of Erythrocytes:**
- Erythrocytes (red blood cells) are responsible for transporting oxygen. In Pheretima, these erythrocytes contain hemoglobin.

4. **Evaluate the Options:**
- **Option A: Hemoglobin** - This is correct as Pheretima's erythrocytes contain hemoglobin dissolved in the blood plasma.
- **Option B: Erythroclopin** - This is incorrect as erythroclopin is not present in Pheretima.
- **Option C: Hemocyanin** - This is also incorrect because hemocyanin is found in arthropods and mollusks, not in Pheretima.
- **Option D: Erythrocytes are absent** - This is incorrect since Pheretima does have erythrocytes.

5. **Conclusion:**
- The correct answer is that the erythrocytes of Pheretima contain hemoglobin.

**Final Answer:**
Erythrocytes of Pheretima contain hemoglobin.

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