Question

Which structure is known as the lower lip of cockroach?
A. Labrum
B. Labium
C. Mantum
D. Submentum

Answer 1

Hint: Cockroaches are the insects that belong to the order Blattodea. Most of the cockroaches are about the size of a thumbnail. The body of cockroach is segmented and divided into a head, a thorax and an abdomen.

Complete Answer:
- Cockroaches are brown or black coloured insects.
- Their heads point downwards. Male cockroaches usually have wings but female cockroaches do not possess wings.
- Cockroaches have three pairs of jointed legs, one pair of antennae and a rigid exoskeleton.
- The exoskeleton of cockroaches is made up of calcareous plates that are called sclerites.
- The adjacent segments of the body of the cockroach are joined by a thin, soft and flexible arthrodial membrane.

Mouth parts of the cockroach:
Mouth is the ventral opening of the body of the earthworm. The mouth is present on the head and remains surrounded by the mouth parts. The mouth parts of the cockroach help in biting and chewing the food. The mouth parts of cockroach are-
1. Labrum – Labrum is the flap-like structure that lies immediately in front of the mouth. It is the upper lip of the cockroach’s mouth.
2. Mandibles – Mandibles are the pair of appendages near the mouth of an insect. Their function is to grasp, crush or cut the food particles.
3. First Maxillae – It is one –pair and forms a lateral wall of the preoral cavity.
4. Labrum – Labium is the lower lip of the mouth of the insect.
5. Hypopharynx – It is a small cylindrical mouth part sandwiched between the first maxillae. It is covered by the labium and labrum.

Hence, option B is the correct option for this question.

Note: Cockroaches are the recyclers. They can chow down anything including dead plants and animals and animal waste. Their digestive system consists of many bacteria and protozoans that can convert the waste organic particles into easily absorbed nutrients.