In cockroach the number of soiracles is :

Options

A. 8
B. 10
C. 20
D. 14

Answer

To determine the number of spiracles in a cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Understand what Spiracles are**: Spiracles are external openings that are part of the respiratory system in insects, including cockroaches. They allow air to enter the body for respiration.

2. **Identify the Respiratory System of Cockroach**: The respiratory system of a cockroach consists of a network of tubes known as tracheae. These tubes transport oxygen directly to the tissues of the body.

3. **Count the Number of Spiracles**: In cockroaches, there are 10 pairs of spiracles. This means there are a total of 20 spiracles (10 pairs x 2 spiracles per pair).

4. **Locate the Spiracles**: The spiracles are located on the lateral (side) surfaces of the cockroach's body. They are positioned in such a way that they facilitate the efficient exchange of gases.

5. **Regulation of Spiracles**: The opening and closing of spiracles are controlled by small muscles called sphincters, which help regulate airflow into the tracheal system.

6. **Conclude with the Correct Answer**: Based on the information, the total number of spiracles in a cockroach is 10 pairs, which equals 20 spiracles.

### Final Answer:
The number of spiracles in a cockroach is **20**.

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