locomotion of cockroach
Answers
Answer:Cockroach is a swift runner as well as a flier. The six legs are helpful in walking or running, when the cockroach is at rest, the coxae of the legs lie back against the body and the first legs are directed forward, the hind legs are stretched out posteriorly and the middle legs take whatever position is convenient.
During locomotion the first pair of leg is directed forward, they determine the course of the insect during walking or running. In locomotion on land the six legs are used as two tripods.
The first and third legs of one side and the middle leg of the other side form a triangle on which the insect rests, while the other three legs are advanced and placed on the substratum. Then the first leg pulls and the third leg pushes, the middle leg of the opposite side acts as a pivot. The process is repeated by the other three legs and the insect moves in a zig-zag fashion.
The wings are used during flight. The fore-wings are held at right angles to the body axis and they do not beat. In fact, the beating of hind-wings with the help of flight muscles helps the cockroach in flying.
The wings beat upward and downward alternately. The wings beat obliquely and at every downward beat, the wings push the air downwards and backwards. Due to this, its body is propelled upwards and forwards. Thus, by repeating this process in quick succession, cockroach flies.
Explanation:
1. During walking or running, cockroach forms two tripods with it's six legs .
2.Each tripod in cockroach is formed by foreleg and hindleg of one side and middle leg of the other side (R1,L2,R3 forms one tripod and other is formed by (L1,R2,L3)