Cockroach blood does not contain respiratory pigment. It means:

In cockroach, excretion is brought about by-

$A$. Phallic gland    $B$. Urecose gland    $C$. Nephrocytes    $D$. Fat body     $E$. Collaterial glands

Choose the correct answer from the options given below :

The blood of a cockroach contains no respiratory pigment. This means that:

The gizzard of a cockroach is a part of which system?

The number of chambers in the heart of a cockroach is .....?

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 ........ .