NEET2020ZoologyStructural Organisation in AnimalsActual
If the head of cockroach is removed, it may live for few days because
Options
- 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
- Cthe head holds a 1/3 rd 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.
Correct answer
B. the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its
Step-by-step solution
NERVOUS SYSTEM: The nervous system of the cockroach consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side. Brain: It is present in the head. It is made up of a pair of supra oesophageal which is the present above esophagus. It supplies nerves to antennae and compound eyes. The sub-oesophageal ganglia are present below the esophagus. These ganglions are connected together by paired longitudinal connectives on the ventral side. Double Ventral Nerve C