Segmentation in earthworm is:-

Options

A. Metameric segmentation
B. Polymeric segmentation
C. Psuedosegmentation
D. Bisegmentation

Answer

**Step-by-Step Solution:**

1. **Identify the Phylum of Earthworm**: Earthworms belong to the Phylum Annelida. This is crucial as it helps us understand the characteristics associated with this group.

2. **Understand Segmentation**: Segmentation refers to the division of the body into repetitive segments. In the case of earthworms, this segmentation is a key feature of their anatomy.

3. **Define Metameric Segmentation**: Metameric segmentation is a type of segmentation where the body is divided into a series of repeating segments, both internally and externally. Each segment can contain similar structures, such as muscles, nerves, and blood vessels.

4. **Evaluate the Options**:
- **Option 1: Metameric Segmentation** - This is the correct answer as it accurately describes the segmentation in earthworms.
- **Option 2: Polymeric Segmentation** - This term is not commonly used in biological classification.
- **Option 3: Pseudo Segmentation** - This refers to a false segmentation and does not apply to earthworms.
- **Option 4: Biosegmentation** - This term is not standard in the context of earthworm segmentation.

5. **Conclusion**: Based on the analysis, the correct answer is that segmentation in earthworms is classified as **Metameric Segmentation**.

**Final Answer**: Segmentation in earthworm is Metameric Segmentation.

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