Identify $P, Q$, and $R$ in the given diagram of the male reproductive system of a cockroach.

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

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

Refer to the given figure of the female reproductive system of a cockroach and identify the correct labels (marked as $1, 2, 3$ and $4$) which are collectively called the genital pouch.

Match the following columns with reference to cockroach and select the correct option:

Column $I$	Column $II$
$(a)$ Grinding of the food particles	$(i)$ Hepatic caecae
$(b)$ Secrete gastric juice	$(ii)$ $10^{\text{th}}$ segment
$(c)$ $10$ pairs	$(iii)$ Proventriculus
$(d)$ Anal cerci	$(iv)$ Spiracles

Read the following statements and choose the correct option:
$(A)$ The cockroach nervous system consists of a series of fused,segmentally arranged ganglia.
$(B)$ Ganglia are joined in the cockroach by paired longitudinal connectives on the ventral side.
$(C)$ The nervous system is present on the dorsal side of the cockroach.
$(D)$ In the cockroach,the total number of ganglia is nine.