A) two pair in thorax and hundred pairs in abdomen
B) two pair in thorax and six pair in abdomen
C) two pair in thorax and eight pair in abdomen
D) two pair in thorax and four pair in abdomen
Correct Answer: C
Solution :
Spiracles or stigmata are special value containing tubules through which atmospheric air enters and escape out during gaseous exchange in cockroach. There are 20 spiracles, out of these two pair are found in thoracic portion and rest 8 pair are located in abdomen region. Thoracic stigmata are somehow larger than abdominal spiracles.
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