Statement I : The opening of spiracles in cockroaches is regulated by sphincters.
Statement II : The heart of a cockroach consists of an elongated muscular tube lying along the mid dorsal line of the thorax and abdomen.

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Both S I and S II are correct.

Both S I and S II are wrong.

S I is correct but S II is wrong.

S I is wrong but S II is correct.

answer is A.

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Detailed Solution

Both S I and S II are correct.

Statement I is correct. Spiracles are the external openings on the bodies of insects, including cockroaches, which allow for the exchange of gases between the insect's body and the environment. The opening and closing of spiracles are regulated by sphincters, which are muscular structures that control the size of the opening.

Statement II is correct. The heart of a cockroach consists of an elongated muscular tube located along the mid-dorsal line of the thorax and abdomen. This tubular heart pumps hemolymph (the insect equivalent of blood) throughout the insect's body, circulating nutrients, hormones, and waste products. The tubular heart is a characteristic feature of insects, including cockroaches.

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