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

1. the cockroach does not have nervous system.
2. the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
3. the head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.
4. the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.

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

Solution

A cockroach can survive briefly without its head because only a small part of its nervous system is in the head. The major nerve cord and ganglia are located along the ventral side, so many basic functions can continue for some time.

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