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Solution


Q.

If the head of a cockroach is removed, it may live for a few days because                 [2020]
1 The supra-oesophageal ganglia of the cockroach are situated in the ventral part of the abdomen.  
2 The cockroach does not have a nervous system.  
3 The head holds a small proportion of a nervous system, while the rest is situated along the ventral part of its body.  
4 The head holds 1/3rd of a nervous system, while the rest is situated along the dorsal part of its body.  

Ans.

(3)

The head holds a bit of a nervous system of the cockroach, 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.