Which of the following is false regarding the respiratory system of cockroach?

Options

A. Opening of spiracles is regulated by sphincters
B. Exchange of gases takes place at the tracheoles by diffusion
C. Oxygen carrying respiratory pigment is haemoerythrin
D. Trachea has non-collapsible wall

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks us to identify which statement regarding the respiratory system of the cockroach is false.

2. **Reviewing the Statements**: We need to analyze each statement provided about the respiratory system of the cockroach to determine its validity.

3. **Statement Analysis**:
- **Statement 1**: "Opening of spiracles is regulated by sphincters."
- This statement is true. The spiracles, which are openings on the cockroach's body, are indeed regulated by sphincters that control the entry and exit of gases.

- **Statement 2**: "Exchange of gas takes place at the tracheoles by diffusion."
- This statement is also true. Gas exchange occurs in the tracheoles through the process of diffusion, where oxygen enters the body and carbon dioxide is expelled.

- **Statement 3**: "Oxygen carrying respiratory pigment is Hemoerythrin."
- This statement is false. The respiratory pigment in cockroaches is not Hemoerythrin; it is Hemocyanin, which contains copper and gives the blood a blue color. Hemoerythrin is found in some other organisms, including humans.

- **Statement 4**: "Trachea has a non-collapsible wall."
- This statement is true. The trachea of cockroaches have a non-collapsible structure, which helps maintain the integrity of the air passages and prevents gas leakage.

4. **Conclusion**: The false statement regarding the respiratory system of the cockroach is the third statement: "Oxygen carrying respiratory pigment is Hemoerythrin."

**Final Answer**: The false statement is: "Oxygen carrying respiratory pigment is Hemoerythrin."

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