Housefly feeds on sugar by

What is the position of the testis in Periplaneta americana?

Match the following columns regarding the anatomy of a cockroach:

Column-$I$	Column-$II$
$P$. Seventh sternum	$I$. Boat-shaped
$Q$. Eighth and ninth sterna	$II$. Anal styles
$R$. $10$th segment	$III$. Genital pouch

Explain the reproductive system of a male cockroach.

The figure given below shows the alimentary canal of a cockroach with a few structures labelled as $1, 2, 3$ and $4$. Identify the structure which is also called proventriculus and helps in grinding the food particles.

Identify the location of hepatic or gastric caeca in a cockroach.