Earth worm contains blood pigment:-

Options

A. Haemoglobin
B. Haemocyanin
C. Haematin
D. Melanin

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the blood pigment present in earthworms. We need to identify which of the given options (hemoglobin, hemocyanin, hematin, or melanin) is correct.

2. **Identifying the Blood Pigment**: Earthworms, specifically the species Ferritima, contain hemoglobin as their blood pigment. Hemoglobin is known for its role in transporting oxygen in many organisms.

3. **Comparing with Other Organisms**: In mammals, hemoglobin is found within red blood cells (RBCs), which give blood its red color. However, in earthworms, red blood cells are absent.

4. **Presence of Hemoglobin**: In earthworms, hemoglobin is present in a dissolved form within the plasma of the blood. This is a key distinction from mammals, where hemoglobin is contained within RBCs.

5. **Conclusion**: Based on the information gathered, the correct answer to the question is that earthworms contain hemoglobin as their blood pigment.

### Final Answer:
Earthworm contains blood pigment: **Hemoglobin**.

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