Which part in cockroach is fundamentally analogous to nostrils of man:

Options

A. Hypopharynx
B. Antenna
C. Spiracles
D. Labrum

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the part of a cockroach that is fundamentally analogous to the nostrils of a human. "Analogous" means that the two structures serve a similar function, even if they are different in form.

2. **Identifying the Function of Nostrils**: In humans, nostrils are openings that allow air to enter and exit the respiratory system. They play a crucial role in the process of breathing by facilitating the inhalation of air and the exhalation of carbon dioxide.

3. **Exploring the Options**: The options provided are:
- Hypopharynx
- Antenna
- Spiracle
- Labrum

4. **Analyzing Each Option**:
- **Hypopharynx**: This is involved in feeding and does not serve a respiratory function.
- **Antenna**: These are sensory organs and do not play a role in respiration.
- **Spiracle**: These are small openings on the body of the cockroach that allow air to enter the tracheal system, which is used for respiration.
- **Labrum**: This is a part of the mouthparts and is not related to respiration.

5. **Identifying the Correct Answer**: Since the spiracles allow air to enter the cockroach's body in a manner similar to how nostrils function in humans, the correct answer is **Spiracle**.

6. **Final Answer**: The part in a cockroach that is fundamentally analogous to the nostrils of man is the **Spiracle**.

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