Which is a characteristic of a cockroach?

Blood does not transport oxygen in

$A$: In cockroach,inspiration is a passive process.
$R$: Expansion of abdominal cavity allows the space for expansion of the tracheal trunk,as a result,air enters through the spiracle.

In cockroach,which of the following is the principal motor centre?

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.

In male cockroaches,sperms are stored in which part of the reproductive system?