Choose the wrong statement

Options

A. Teeth of chondrichthyes are modified ctenoid scales
B. Air bladder in fishes regulates buoyancy
C. In amphibians, the tympanum represents the ear
D. Long bones in birds are pneumatic

Answer

To solve the question "Choose the wrong statement," we will analyze each statement provided and determine which one is incorrect.

### Step-by-Step Solution:

1. **Statement 1: Teeth of Chondrichthyes are modified tenoid scales.**
- Chondrichthyes refers to cartilaginous fishes like sharks and rays. The teeth of Chondrichthyes are actually modified placoid scales, not tenoid scales. Therefore, this statement is incorrect.

2. **Statement 2: Air bladder in fishes regulates buoyancy.**
- The air bladder, also known as the swim bladder, is an internal gas-filled organ found in many bony fishes. It helps regulate buoyancy, allowing these fishes to maintain their depth in the water without expending energy. This statement is correct.

3. **Statement 3: In amphibians, the tympanum represents the ear.**
- The tympanum in amphibians is indeed an external membrane that functions to transmit sound waves to the inner ear. This statement is correct.

4. **Statement 4: Long bones in birds are pneumatic.**
- Pneumatic bones are hollow and connected to the respiratory system, which aids in respiration and reduces weight for flight. This statement is also correct.

### Conclusion:
The incorrect statement among the options provided is **Statement 1: Teeth of Chondrichthyes are modified tenoid scales.**

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