Question

How many pairs of legs are present in cockroaches?
A) Three
B) Two
C) One
D) None of the above

Answer 1

Hint:Cockroaches are insects and there are about 30 cockroach species out of 4600 that are associated with human habitats. Five of the species are known as pests.

Complete answer:
The body is divided into three parts- head, thorax and abdomen. Abdomen has ten segments each consisting of spiracles that help in respiration. The external surface has a tough exoskeleton that contains calcium carbonate and provides attachment to muscles. Wings are present which are attached to the second and third thoracic segments. The tegmina is the first pair of wings that is tough and protective. Tegmina wings are lying on the top of the membranous wings called hind wings. All the four wings have branching longitudinal veins and multiple cross veins.
Cockroaches are abundant throughout the world and live in tropics as well as subtropics environments. They are nocturnal and run away when exposed to light.
The thorax has three pairs of legs. Each segment of thorax consists of a pair of walking legs named as prologs, meso legs and meta legs. The front legs are the shortest and hind legs are longest.

Hence the correct answer is option ‘A’.

Note:Cockroaches are the hardiest insects. They have been used as insect models in the laboratory and in the fields of neurobiology, reproductive physiology and social behavior. They are used in the experiments on the topics like spatial orientation, behavioral ecology, sexual pheromones, aggression etc.