In Star-fish which has dual function of locomotion and respiration?

Options

A. Axial sinus
B. Ampullae
C. Tube feet
D. Tiedmann's body

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which structure in starfish serves the dual purpose of locomotion and respiration.

2. **Identifying the Options**: The options provided are:
- Axial sinus
- Ambulacral feet
- Tiedman's body

3. **Analyzing Each Option**:
- **Axial Sinus**: This is involved in the circulatory system of the starfish but does not perform locomotion or respiration.
- **Ambulacral Feet**: These are tube-like structures that extend from the ambulacral grooves on the underside of the starfish's arms. They are used for locomotion, feeding, and respiration.
- **Tiedman's Body**: This structure is related to the water vascular system but does not directly contribute to locomotion or respiration.

4. **Conclusion**: The structure that serves the dual function of locomotion and respiration in starfish is the **ambulacral feet**. These feet help in moving the starfish and also assist in gas exchange.

5. **Final Answer**: The correct answer is **ambulacral feet**.

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