All of the following are the functions of water-vascular system, except

Options

A. Locomotion
B. Respiration
C. Reproduction
D. Capture of food

Explanation

To solve the question regarding the functions of the water-vascular system, we will analyze each of the options provided and determine which one does not belong to the functions of the water-vascular system in echinoderms.

### Step-by-Step Solution:

1. **Understanding the Water-Vascular System**:
- The water-vascular system is a unique feature found in echinoderms (such as starfish, sea urchins, etc.). It is a network of fluid-filled canals that serve various functions.

2. **Identifying the Functions**:
- **Locomotion**: The water-vascular system plays a crucial role in locomotion. It operates the tube feet, allowing echinoderms to move.
- **Respiration**: The water-vascular system also assists in respiration. It helps in gas exchange through structures called papulae or gills.
- **Food Capturing**: The system aids in capturing food, as it helps in the movement of tube feet to grasp prey.

3. **Analyzing the Options**:
- The options provided are:
- A) Locomotion
- B) Respiration
- C) Reproduction
- D) Rupture of ovary
- From our understanding, locomotion, respiration, and food capturing are all functions of the water-vascular system.

4. **Identifying the Odd One Out**:
- **Reproduction**: While echinoderms can reproduce, this process does not involve the water-vascular system. Instead, reproduction occurs through other means, such as external fertilization.
- **Rupture of ovary**: This is not a function of the water-vascular system either, but it is more related to the reproductive process.

5. **Conclusion**:
- The correct answer to the question "All of the following are the functions of the water-vascular system, except" is **C) Reproduction**.