NEETBiologyAnimal KingdomMCQ+4 / −1
If the head of cockroach is removed, it may live for few days because
- Athe cockroach does not have nervous system.
- Bthe head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
- Cthe head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.
- Dthe supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.
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Correct answer: B
Cockroaches breathe passively through a network of pipes connected to holes called spiracles along the length of their body. They are independent of blood circulation to move oxygen around and their body fluids are at a much lower pressure. The sensory input from the eyes and antennae, along with many other behaviours, are transmitted and handled by their brain such as running and reacting to touch, handled by ‘mini brains’ called ganglia in each body segment. A decapitated cockroach will eventually starve to death but this can still take few days.
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