Which one of the following is one of the paths followed by `air//O_(2)` during respiraton in an adult male Periplaneta americana as it enters the animal body.

Options

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

Explanation

To determine the correct path followed by air (O₂) during respiration in an adult male Periplaneta americana (cockroach), we need to analyze the options provided and understand the respiratory system of the cockroach.

### Step-by-Step Solution:

1. **Understanding the Respiratory System of Cockroach**:
- The cockroach has a unique respiratory system that consists of spiracles, trachea, and tracheoles. Air enters the body through spiracles, which are small openings located on the sides of the thorax and abdomen.

2. **Identifying the Pathway**:
- The pathway of air during respiration in a cockroach begins at the spiracles. The spiracles lead to the trachea, which then branches into smaller tubes called tracheoles that deliver oxygen directly to the tissues.

3. **Analyzing the Options**:
- **Option 1**: Hypopharynx, mouth, pharynx, trachea, tissue - This is incorrect as the hypopharynx and mouth are not involved in the respiration pathway.
- **Option 2**: Spiracle in metathorax, trachea, trachea, oxygen diffusion to the cell - This is correct. The air enters through the spiracle, moves into the trachea, and then diffuses to the cells.
- **Option 3**: Mouth, bronchial tubes, trachea, oxygen enter in the cell - This is incorrect as the mouth does not play a role in the respiration pathway.
- **Option 4**: Spiracles in the prothorax, tracheals, trachea, and oxygen diffuse into the cell - This is incorrect because while spiracles are present, the sequence is not accurate; trachea comes before tracheals.

4. **Conclusion**:
- The correct pathway of air during respiration in an adult male Periplaneta americana is represented by **Option 2**: Spiracle in metathorax, trachea, trachea, oxygen diffusion to the cell.

### Final Answer:
**The correct path followed by air (O₂) during respiration in an adult male Periplaneta americana is: Spiracle in metathorax, trachea, trachea, oxygen diffusion to the cell.**

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