Question

Which of the following is correctly stated as happens in the common cockroach?
A. The food is grinding by mandibles and gizzard
B. Malpighian tubules are excretory organs projecting out from the colon
C. Oxygen is transported by haemoglobin blood
D. Nitrogenous excretory product is urea

Answer 1

The mouthparts are adapted in the primitive insects for crushing solid food, chewing, pinching, and grinding and known as the name of mandibulate that has chewing mandibles features in the prominent. Labrum, mandibles, maxillae, hypopharynx, and labium are the five basic components present in it.

Complete answer:
Ammonia is the respiratory products of the cockroach in which respiratory pigments helped with the haemocyanin rather than the respiratory pigments that are not haemoglobin in the midgut from the Malpighian tubules project in the cockroach. For the grinding of the food, mandible to be used. The upper jaws that covered with the simple flap called the labrum, for grinding the food, crushing a pair of jaws called the mandibles, for the taste sensory function called the maxillae, for mixing the saliva and food in hypopharynx and labium are the sensory function inside it. Biting, lapping, piercing or sucking, sponging, siphoning are the types of the mouth part. The true jaws and primary jaws called mandibles and adductors provide inner movement and abductors provide outer movement and have heavily sclerotized. Incisors and cutting teeth are the area in which distal teeth are sharply pointed and grinding teeth or molar teeth known as the name of proximal teeth.

Therefore, the correct option is (A).

Note: In the reduced condition labial palps and maxillary palps found, labium is also reduced in the upper lip, hypopharynx is absent in the mandible, triangular plates that are present in the pair of labial palps are reduced in the labium.