Oxygen carrying blood pigment of Earthworm is

Options

A. Haemocyanin
B. Haemoglobin
C. Haemoerythrin
D. Chlorocruorin

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks for the oxygen-carrying blood pigment of the earthworm.

2. **Consider the Options**: The options provided are:
- Haemocyanin
- Haemoglobin
- Haemorythrin
- Chlorochlorin

3. **Understand Earthworm Physiology**: Earthworms belong to the phylum Annelida and have a closed circulatory system. This means that their blood is contained within vessels.

4. **Research the Blood Pigments**:
- **Haemocyanin**: This is a copper-containing pigment found in some mollusks and arthropods, not in earthworms.
- **Haemoglobin**: This is the iron-containing protein responsible for transporting oxygen in many animals, including earthworms.
- **Haemorythrin**: This is found in some marine invertebrates and is not present in earthworms.
- **Chlorochlorin**: This is a pigment found in certain insects and some annelids, but not in earthworms.

5. **Conclude the Correct Answer**: Based on the information, the oxygen-carrying blood pigment of the earthworm is **Haemoglobin**.

### Final Answer:
The oxygen-carrying blood pigment of the earthworm is **Haemoglobin**.

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