Phaosome in Earthworm is

Options

A. Lens
B. Pigment
C. Nephridium
D. Hormone

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about "Phaosome" in earthworms. We need to identify what it is among the given options: lens, pigment, nephridium, and hormone.

2. **Identifying Earthworm Characteristics**: Earthworms belong to the phylum Annelida. They are nocturnal creatures, meaning they are more active at night and are sensitive to light.

3. **Photoreceptor Cells**: Earthworms do not have traditional eyes but possess photoreceptor cells that help them detect light. These cells are crucial for their survival as they allow them to navigate their environment.

4. **Defining Phaosome**: The transcript mentions that these photoreceptor cells are referred to as "phaosome." They are described as L-shaped lenses that function as part of the optic organelle in earthworms.

5. **Analyzing the Options**:
- **Lens**: The transcript states that the phaosome is an L-shaped lens, which is the correct answer.
- **Pigment**: While there is a pigment (hyaline) that assists in vision, the phaosome itself is not a pigment.
- **Nephridium**: This is an excretory organ in earthworms and is not related to the function of the phaosome.
- **Hormone**: Phaosome is not a hormone, making this option incorrect.

6. **Conclusion**: Based on the analysis, the correct answer to the question "Phaosome in earthworm is" is **lens**.

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