Choose the correct statement for Periplaneta americana
It has $6$ muscular hearts
It has $10$ thoracic segments
Anal style is present in both male and female
It is nocturnal and present in damp places
Complete the following statement :
$(a)$ In cockroach grinding of food particle is performed by ........ .
$(b)$ Malpighian tubules help in removal of ........ .
$(c)$ Hind gut of cockroach is differentiated into ........ .
$(d)$ In cockroach blood vessels open into spaces called ........ .
Describe circulatory system of cockroach.
Describe digestive tract or alimentary canal of cockroach with diagram.
Cescribe the Respiratory cavities of cockroach.
The blood of cockroach contains no respiratory pigment. It means that