Question

write a short note on marphology of cockroach and structure with its complete description

Answer 1

The body of the cockroach is elongated and segmented. 
It is dark brown or reddish brown in colour.
The exoskeleton is thick and hard made up of calcareous plates called sclerites. There are 10 segments. The segments on 
— on dorsal side (or notum) are called Tergum
—on ventral side are called Sternum.
The exoskeleton is coated with wax impermeable to water. It protects the body from loss of water and provides rigidity and surface for attachment of body muscles.
The adjacent segments are joined by thin, soft and flexible arthroidal membrane.
The body is divisible into head, thorax and abdomen.
The cockroach has three pairs of jointed appendages and two pairs of wings.
The fore wings are mesothoracic and are called wing covers or tegmina or elytra. They cover the hindwings and are protective in function. These are dark stiff opaque and leathery.
The hind wings are large, thin, membranous and transparent. They are kept folded below the tegmina and are used for flying.