Segments having no setae in earthworm are -

Options

A. First
B. Last
C. Clitellar
D. First, last and clitellar

Answer

To answer the question about which segments of the earthworm have no setae, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Earthworm Segmentation**:
- Earthworms have a segmented body structure. Each segment is known as a somite or metamere.

2. **Identifying Segments Without Setae**:
- In earthworms, the first segment (the prostomium) and the last segment (the anal segment) do not have setae.
- Additionally, the clitellum, which is a thicker band found in the middle of the body, also lacks setae.

3. **Conclusion**:
- Therefore, the segments that do not have setae in earthworms are the first segment, the last segment, and the clitellum.

4. **Final Answer**:
- The correct answer is: the first segment, the last segment, and the clitellum.