Locomotion occurs is Earthworm with the help of

Options

A. Setae
B. Setae and circular muscles
C. Parapodia
D. Setae, circular muscles and longitudinal muscles

Answer

**Step-by-Step Solution:**

1. **Understanding Earthworm Anatomy:**
- Earthworms belong to the phylum Annelida and have a segmented body structure. Each segment plays a role in locomotion.

2. **Muscle Types Involved in Locomotion:**
- Earthworms have two main types of muscles that aid in movement: circular muscles and longitudinal muscles.
- **Circular Muscles:** When these muscles contract, they make the body segment thinner and longer.
- **Longitudinal Muscles:** When these muscles contract, they shorten the segment, making it thicker.

3. **Role of Setae:**
- Setae are small, bristle-like structures found on each segment of the earthworm. They help the earthworm grip the soil, providing traction during movement.

4. **Combining Structures for Locomotion:**
- The locomotion of an earthworm is achieved through the coordinated action of:
- Circular muscles
- Longitudinal muscles
- Setae
- Together, these structures allow the earthworm to move effectively through the soil.

5. **Identifying the Correct Option:**
- The question asks for the components that aid in locomotion. The correct answer is the combination of setae, circular muscles, and longitudinal muscles.

**Final Answer:**
Locomotion occurs in earthworms with the help of setae, circular muscles, and longitudinal muscles.

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