NEET BIOLOGY

Detailed explanation-1: -The segments on the dorsal side are called Tergum and those on the ventral side are called the sternum. The cockroach has three pairs of jointed appendages and two pairs of wings.

Detailed explanation-2: -The sternum (pl. “sterna") is the ventral portion of a segment of an arthropod thorax or abdomen.

Detailed explanation-3: -Ventrally, an opening called mouth is present on the head that remains surrounded by the mouth parts consisting of a pair of mandibles, first maxillae, labium or fused second maxillae, hypopharynx and labrum. The mouth parts of the cockroach help in ‘biting and chewing’ its food.

Detailed explanation-4: -The correct option is C tergites. Cockroaches possess hard exoskeleton plates called sclerites. Tergites are the sclerites found on the dorsal side, while sternites are those seen on the ventral side of a cockroach’s body.

Detailed explanation-5: -So, the number of sterna present at the abdomen of female cockroach is 7 and in males is 8.