Correct path of air during respiration of Periplaneta is

Options

A. Mouth, bronchial tube, trachea, oxygen enters cells
B. Spiracles in prothorax, tracheoles, trachea, oxygen diffuses into cells
C. Hypopharynx, mouth, pharynx, trachea, tissues
D. Spiracles in metathorax, trachea, tracheoles, oxygen diffuses into cells

Answer

To determine the correct path of air during respiration in Periplaneta (the cockroach), we need to understand the respiratory system of this organism. Here’s a step-by-step breakdown of the process:

### Step-by-Step Solution:

1. **Spiracles**: The process of respiration in cockroaches begins with the spiracles, which are small openings located on the sides of their body. These openings allow air to enter the respiratory system.

2. **Trachea**: Once the air enters through the spiracles, it travels into the trachea. The trachea are larger tubes that transport air deeper into the body.

3. **Tracheoles**: The trachea further divide into smaller branches called tracheoles. These are fine tubes that extend throughout the body, reaching various tissues and cells.

4. **Diffusion into Cells**: Finally, oxygen from the air diffuses from the tracheoles into the cells of the cockroach. This is where the oxygen is utilized for cellular respiration, allowing the cockroach to produce energy.

5. **Carbon Dioxide Removal**: The process is reversed for carbon dioxide, which diffuses from the cells back into the tracheoles, then into the trachea, and finally exits the body through the spiracles.

### Correct Path of Air:
The correct path of air during respiration in Periplaneta is:
- Spiracles (in prothorax or metathorax) → Trachea → Tracheoles → Oxygen diffuses into cells.

### Final Answer:
The correct option is: Spiracles (in prothorax or metathorax) → Trachea → Tracheoles → Oxygen diffuses into cells.

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