Q:

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

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