A) 2 pairs in thorax and 100 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
Correct Answer: C
Solution :
Spiracles or stigmata are special valve containing tubules through which atmospheric air enters and escapes out during gaseous exchange in cockroach. Spiracles are 20 in number, out of these 2 pairs are found in thoracic portion while rest 8 pairs are found in abdominal portion. Thoracic spiracles are somehow larger than abdominal spiracles. Peritreme, a ring like sclerite surrounds each spiracle.
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