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Q.

Which of the following is a correct statement about cockroaches? 

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a

The food is ground by mandibles and gizzard.

b

Malpighian tubules are excretory organs projecting out from the colon.

c

Oxygen is transported by haemoglobin in blood.

d

Nitrogenous excretory product is urea.

answer is A.

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Detailed Solution

Malpighian tubules are excretory organs at the junction of the mesenteron and ileum (not colon) of the hindgut.

Oxygen is transported by tracheal tubes.

Nitrogenous excretory product is uric acid.

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