Question

How many pair of spiracles are present in thorax region of cockroaches?

• A. 10
• B. 2
• C. 8
• D. 6

Answer 1

Answer: (B)

• The tracheal system of cockroach communicates with the exterior by ten pairs of openings called spiracles.
• The first 2 pairs of spiracles are present in the thoracic segments, one pair in mesothorax and one pair in the metathorax.
• The remaining 8 pairs of spiracles are present in the first eight abdominal segments.

So, the correct option is '2'.