Identify the locomotary organs in annelida.

Options

A. Tube feet
B. Setae
C. Pseudopodia
D. Flagella

Answer

### Step-by-Step Solution:

1. **Understanding Annelida**: Annelida, commonly known as segmented worms, include earthworms, leeches, and polychaetes. They are characterized by their segmented bodies.

2. **Identifying Locomotory Organs**: The primary locomotory organs in Annelida are structures that facilitate movement. In Annelids, the main locomotory structures are called **setae**.

3. **Role of Setae**: Setae are small bristle-like structures located on the surface of the body segments. They help in anchoring the worm to the ground and provide traction during movement.

4. **Movement Mechanism**: Annelids move using a combination of muscular contractions and the action of setae. The muscles contract to create waves of movement, while the setae grip the substrate, allowing the worm to push itself forward.

5. **Conclusion**: Therefore, the locomotory organs in Annelida are the **setae**, which enable them to move in a wave-like motion.