Main function of phorphyrin pigment present in earthworm:-

Options

A. Help in respiration
B. Helps in reproduction
C. Makes the worm beautiful
D. Protection from adverse effects of sun

Answer

### Step-by-Step Solution:

1. **Identify the Pigment**: The pigment in question is the porphyrin pigment found in earthworms.

2. **Understand the Functions of Porphyrin Pigment**: The porphyrin pigment serves several potential functions, but we need to focus on its primary role.

3. **Evaluate the Options**: The options provided include:
- A) Respiration
- B) Reproduction
- C) Aesthetic (beauty)
- D) Protection against UV rays

4. **Analyze Each Function**:
- **Respiration**: The porphyrin pigment does not play a significant role in the respiratory process of earthworms.
- **Reproduction**: There is no evidence to suggest that this pigment is involved in the reproductive processes of earthworms.
- **Aesthetic (beauty)**: The pigment does not serve a purpose related to making the earthworm visually appealing.
- **Protection against UV rays**: The primary function of the porphyrin pigment is to provide protection against ultraviolet (UV) rays from the sun, which can be harmful.

5. **Conclusion**: Based on the analysis, the main function of the porphyrin pigment in earthworms is to protect them from the adverse effects of UV rays.

6. **Final Answer**: Therefore, the correct answer is option D) Protection against UV rays.