Which of the following structures in a cockroach are made up of chitin?

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 statement$(s)$ is/are correct about the nervous system of a cockroach?
$(i)$ It consists of a series of fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
$(ii)$ There are six ganglia lie in the thorax,and three in the abdomen.
$(iii)$ The sense organs are antennae,eyes,maxillary palps,labial palps,and anal cerci,etc.
$(iv)$ Each eye consists of about $5000$ hexagonal ommatidia.

In which segment of the body of the male cockroach is the mushroom-shaped gland found?

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 :

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