Phallic organs in cockroach are related to

The salivary duct of a cockroach opens at:

In cockroach,the testes are present in

Excretion in cockroach is performed by all,$EXCEPT$ :

Which organ is responsible for the transport of oxygen to the tissues in a cockroach?

$A$: 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.