If the head of cockroach is removed, it may live for few days because

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the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.

the head holds a 1/3^rd of a nervous system while the rest is situated along the dorsal part of its body.

the cockroach does not have nervous system.

the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.

answer is B.

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Detailed Solution

The head holds a bit of a nervous system while the rest is situated along the ventral (belly-side) part of its body. So, if the head of a cockroach is cut off, it will still live for as long as one week. In the head region, the brain is represented by supra-oesophageal ganglion which supplies nerves to antennae and compound eyes.

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