The conglobate gland is present in the reproductive system of . . . . . . .

Match the following columns regarding the reproductive system of a cockroach:

Column-$I$	Column-$II$
$P$. Testes	$I$. $2$nd to $6$th segments
$Q$. Mushroom gland	$II$. $6$th to $7$th segments
$R$. Ovaries	$III$. $6$th segment
$S$. Seminal vesicles	$IV$. $4$th to $6$th segments

Which of the following does not take part in excretion in a cockroach?

The colleterial glands in a cockroach help in .....

Describe the digestive system of a cockroach.

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 ........ .