Q.

Select the correct option with respect to Periplaneta americana.

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a

 Exchange of gases take place at the tracheoles by diffusion.

b

Spiracles are present on the ventral side of the body.

c

Respiratory system consists of 13 pairs of small holes called spiracles.

d

 Opening of the spiracles is regulated by the alary muscles.

answer is A.

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Detailed Solution

The exchange of gases take place at tracheoles by diffusion in the respiratory system of cockroach . It consists of a network of trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body. The opening spiracles is regulated by sphincters. 

Alary muscles are associated with the circulation in cockroach.

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