Segment of earthworm bearing mouth is

Options

A. clitellar
B. peristomium
C. prostomium
D. deuterostomium.

Answer

To answer the question "Segment of earthworm bearing mouth is", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Phylum**: Understand that the earthworm belongs to the phylum Annelida, which is characterized by its segmented body structure.

2. **Understand Metameric Segmentation**: Recognize that the body of the earthworm is divided into approximately 120 segments known as metameres.

3. **Segment Classification**: Classify the segments into three main parts:
- **Pre-clitellar Segments**: Segments 1 to 3, which are before the clitellum.
- **Clitellum Segment**: Segments 14 to 16, which are involved in reproduction.
- **Post-clitellar Segments**: Segments that come after the clitellum.

4. **Identify the Mouth Segment**:
- The first segment of the earthworm is called the **Prostomium**, but it does not bear the mouth.
- The second segment, known as the **Peristomium**, is the segment that bears the mouth.

5. **Conclusion**: Therefore, the segment of the earthworm that bears the mouth is the **Peristomium**.

### Final Answer:
The segment of the earthworm bearing the mouth is the **Peristomium**.

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