In cockroaches,in what form do the body cells primarily discharge their nitrogenous waste into the hemolymph?

Blood does not transport oxygen in

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 ........ .

What is the similarity between the trachea of a cockroach and a rabbit?

The figure given below shows the reproductive system of a female cockroach. The correct labellings indicated by alphabets $(A, B, C)$ are respectively:

Select the incorrect statement regarding the heart of a cockroach.