Question

Which is correct in common Cockroach

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

Answer 1

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'.