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Q.

Select the correct statement about cockroach.

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a

Blood vascular system is of closed type.

b

The opening of spiracles is regulated by sphincters.

c

Inspiration is due to contraction of alary muscles.

d

Cockroaches are bisexual animals.

answer is B.

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Detailed Solution

The opening of the spiracles is regulated by the sphincters. Exchange of gases take place at the tracheoles by diffusion.Cockroaches are unisexual.Contraction of alary muscles helps in circulation.Blood vascular system is open type.
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