Choose incorrect statement about respiration.

Options

A. Insects have a network of tubes.
B. Earthworins use their vascularised parapodia as respiratory structures.
C. Amphibians like frogs can respire through moist skin also.
D. Coelenterates exchange `O_2` with `CO_2` by simple diffusion over their entire body surface.

Answer

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

### Step-by-Step Solution:

1. **Analyze the first statement**:
- **Statement**: Insects have a network of tubes.
- **Evaluation**: This statement is correct. Insects possess a tracheal system, which is a network of tubes that facilitates gas exchange.

2. **Analyze the second statement**:
- **Statement**: Earthworms use vascularized parapodia as their respiratory structure.
- **Evaluation**: This statement is incorrect. Earthworms do not use parapodia for respiration; instead, they respire through their skin, which must remain moist for gas exchange to occur.

3. **Analyze the third statement**:
- **Statement**: Amphibians like frogs can respire through moist skin.
- **Evaluation**: This statement is correct. Frogs can respire through their skin, especially when they are in water, in addition to using their lungs.

4. **Analyze the fourth statement**:
- **Statement**: Coelenterates exchange O2 with CO2 through simple diffusion over the entire body surface.
- **Evaluation**: This statement is correct. Coelenterates, such as jellyfish, perform gas exchange through their body surface using simple diffusion.

### Conclusion:
The incorrect statement about respiration is the second one: "Earthworms use vascularized parapodia as their respiratory structure."

### Final Answer:
The incorrect statement is: **Earthworms use vascularized parapodia as their respiratory structure.**

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