Locomotory organs of Echinodermata are

Options

A. Parapodia
B. Pseudopodia
C. Foot
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Echinodermata**: Echinodermata is a phylum of marine animals that includes starfish, sea urchins, and sea cucumbers. They are characterized by their radial symmetry and a unique water vascular system.

2. **Locomotory Organs**: The primary locomotory organs in Echinodermata are tube feet. These structures are part of the water vascular system, which is a network of fluid-filled canals.

3. **Water Vascular System**: The water vascular system plays a crucial role in locomotion. It operates by hydraulic pressure, allowing the tube feet to extend and contract. This movement enables Echinoderms to move across the ocean floor.

4. **Function of Tube Feet**: Tube feet not only assist in locomotion but also help with feeding and respiration. They can adhere to surfaces, allowing Echinoderms to cling to rocks or other substrates.

5. **Absence of Other Locomotory Structures**: Unlike some other invertebrates, Echinoderms do not have parapodia (which are found in annelids) or pseudopodia (which are found in amoebas). Their unique adaptation is the tube feet associated with the water vascular system.

**Final Answer**: The locomotory organs of Echinodermata are tube feet, which function through the water vascular system.

---