Question

Spiracles found in cockroach are ........... which helps in gaseous exchange.

• A. 2 pairs in thorax and 10 pairs in abdomen
• B. 2 pairs in thorax and 6 pairs in abdomen
• C. 2 pairs in thorax and 8 pairs in abdomen
• D. 2 pairs in thorax and 4 pairs in abdomen

Answer 1

Answer: (C)

2 pairs in thorax and 8 pairs in abdomen

• The spiracles are the external openings of the tracheal system.
• They are lateral in position.
• The largest number of spiracles found in insects (cockroaches) are ten pairs, two thoracic and eight abdominal.

So, the correct answer is option C.