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Select the correct statements regarding the respiratory system of Periplaneta.
I) The respiratory system consists of 10 pairs of spiracles.
II) Spiracles are present on the lateral side of the body.
III) The opening of the spiracles is regulated by sphincters.
IV) Exchange of gases occurs at tracheae by diffusion.

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I and II only

I, II and III only

I, II and IV only

II and IV only

answer is B.

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Detailed Solution

10 pairs of spiracles present on pleura open into trachea.

Tracheoles are branched network in tissues arising from tracheae.

Gaseous exchange occurs at tracheoles.

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