Which of the following is not the function of water transport system in sponges?

Options

A. Circulation of food
B. respiratory exchange
C. removal of wastes
D. nervous control

Explanation

To determine which of the following is not a function of the water transport system in sponges, we need to analyze the given options based on the known functions of the water transport system in sponges, which belong to the phylum Porifera.

### Step-by-Step Solution:

1. **Identify the Functions of Water Transport System in Sponges**:
- The water transport system in sponges serves several vital functions, including:
- Circulation of food
- Respiratory exchange (gas exchange)
- Removal of waste (excretion)

2. **Evaluate Each Option**:
- **Option A: Circulation of Food**:
- This is a function of the water transport system as it helps in distributing nutrients throughout the sponge.
- **Conclusion**: This option is a function of the water transport system.

- **Option B: Respiratory Exchange**:
- The water transport system also facilitates respiration by allowing oxygen to diffuse into the sponge and carbon dioxide to be expelled.
- **Conclusion**: This option is a function of the water transport system.

- **Option C: Removal of Waste**:
- The water transport system aids in the removal of waste products from the sponge's body.
- **Conclusion**: This option is a function of the water transport system.

- **Option D: Nervous Control**:
- Nervous control is not a function of the water transport system. Sponges do not have a nervous system; they rely on the water flow for various physiological processes but do not have nervous control associated with the water transport system.
- **Conclusion**: This option is NOT a function of the water transport system.

3. **Final Answer**:
- The option that is not a function of the water transport system in sponges is **Nervous Control**.