The respiratory pigment in a cockroach is:

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(D) In cockroaches,the blood is known as haemolymph. It consists of colourless plasma and haemocytes. Unlike vertebrates or some other invertebrates,t

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(D) In cockroaches,the blood is known as haemolymph. It consists of colourless plasma and haemocytes. Unlike vertebrates or some other invertebrates,the haemolymph of a cockroach does not contain any respiratory pigment like haemoglobin or haemocyanin. Therefore,the blood of a cockroach does not play a role in the transport of respiratory gases (oxygen or carbon dioxide). Instead,respiration occurs through a network of tracheae that deliver oxygen directly to the tissues.

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

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