Housefly feeds on sugar by

Which of the following structures in a cockroach are made up of chitin?

In cockroaches,during the digestion of food,the enzyme cellulase is synthesized by:

Explain the reproductive system of a male cockroach.

How many Malpighian tubules are present at the junction of midgut and hindgut in a cockroach?

Complete the following statement :
$(a)$ In cockroach,grinding of food particles is performed by ........ .
$(b)$ Malpighian tubules help in the removal of ........ .
$(c)$ The hindgut of the cockroach is differentiated into ........ .
$(d)$ In the cockroach,blood vessels open into spaces called ........ .