Question

Number of small holes called spiracles present on lateral side of body in a cockroach is?

• A. $20$
• B. $10$
• C. $12$ pairs
• D. $20$ pairs

Answer 1

The correct option is A $20$

The respiratory system of cockroach consists of a network of the trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body. Thin branching tubes (tracheal tubes subdivided into tracheoles) carry Oxygen from the air to all the parts.

So, the correct answer is '20'