Which of the following is absent in the coelomic fluid of earthworm ?

Options

A. Salts
B. Haemoglobin
C. Corpuscles
D. Proteins

Explanation

To solve the question "Which of the following is absent in the coelomic fluid of earthworm?" we need to analyze the options provided and understand the composition of the coelomic fluid in earthworms.

### Step-by-Step Solution:

1. **Understanding Coelomic Fluid**:
- The coelomic fluid in earthworms serves as a hydrostatic skeleton, providing support to the body. It is primarily composed of water.

2. **Analyzing the Options**:
- **Option 1: Salts** - Coelomic fluid contains various salts that help maintain osmotic balance and other physiological functions.
- **Option 2: Hemoglobin** - Hemoglobin is typically found in the blood plasma of organisms. In earthworms, hemoglobin is present in the plasma but not in the coelomic fluid itself.
- **Option 3: Corpuscles** - The coelomic fluid does contain corpuscles, which are cells that can be involved in various functions including immune responses.
- **Option 4: Proteins** - Proteins are also present in the coelomic fluid, contributing to various physiological processes.

3. **Identifying the Absence**:
- From the analysis, we see that hemoglobin is the only component listed that is absent in the coelomic fluid of earthworms. While it is present in the plasma, it does not exist in the coelomic fluid.

4. **Conclusion**:
- Therefore, the correct answer to the question is **Option 2: Hemoglobin**.