Some structures with their function are given below, mark the wrongly matched one.

Options

A. Choanocytes - Generation of water current
B. Pneumatic bones - Skeletal support
C. Radula - feeding
D. Statocyst - Balance organs

Answer

To solve the question of identifying the wrongly matched structure and function, we will analyze each option provided:

1. **Choanocytes - Generation of water current**
- **Explanation**: Choanocytes are specialized cells found in sponges. Their primary function is to generate a water current through the sponge, which aids in feeding and respiration. This match is correct.

2. **Pneumatic bones - Skeletal support**
- **Explanation**: Pneumatic bones are hollow bones found in birds. They are designed to reduce weight and assist in respiration, not primarily for skeletal support. Therefore, this match is incorrect.

3. **Radula - Feeding**
- **Explanation**: The radula is a tongue-like organ found in mollusks, used for scraping food particles off surfaces. This function is accurately described, making this match correct.

4. **Statocyst - Balance organs**
- **Explanation**: Statocysts are sensory organs found in many aquatic invertebrates that help in maintaining balance and orientation in water. This function is also correctly matched.

Based on the analysis, the wrongly matched structure and function is:

**Pneumatic bones - Skeletal support** (This should be associated with respiration).

### Step-by-Step Solution:
1. Identify the structures and their functions from the options given.
2. Analyze each structure's actual function based on biological knowledge.
3. Compare the provided function with the known function of each structure.
4. Identify the option where the structure and function do not match.
5. Conclude that the incorrect match is "Pneumatic bones - Skeletal support".