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Question

Which is correct in common Cockroach

A
Nitrogenous excretory product is urea.
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B
Food is ground by mandibles and gizzard.
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C
Malpighian tubules are excretory organs that project out from coelom.
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D
Oxygen is transported by haemoglobin in blood.
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Solution

The correct option is B Food is ground by mandibles and gizzard.
Cockroaches use their mandibles, or jaws, to bite and chew their food. The foregut opens into a crop, where undigested food is temporarily stored. From the crop, the food enters the gizzard. The gizzard is a muscular stomach with sharp teeth-like structures that grinds the food into smaller pieces.
So the correct answer is 'Food is ground by mandibles and gizzard'.

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