....... is the function of nephrocytes and urecose glands.

Match the correct pairs regarding the anatomy of a cockroach:

Column-$I$	Column-$II$
$1$. Exoskeleton	$p$. Thorax
$2$. Three ganglia	$q$. Chitin
$3$. One pair of seminal vesicles	$r$. $6^{th}-7^{th}$ segments of abdomen
$4$. Mushroom-shaped gland	$s$. $6^{th}$ segment

Which of the following is correctly described for a common cockroach $(Periplaneta \text{ } americana)$?

In a cockroach, the open circulatory system does not pose a physiological barrier because ...

Haemolymph is the term used for the blood of the organism having

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 ........ .