The stimuli of hunger,thirst,blood pressure,and body balance are received by the:

Arrange the following in the correct sequence in the evolution of the nervous system:
$(a)$ Formation of a centralised nervous system.
$(b)$ Diffused nervous system in $Hydra$.
$(c)$ Formation of a ganglion.
$(d)$ Nervous system is lacking in sponges.

The branch of science associated with the prevention,diagnosis,and treatment of mental disorders is called:

Which system is affected by neurotoxic substances?

Which of the following systems in man is affected by the bite of a cobra?

The ganglia of the sympathetic and the central nervous system in a frog develop from the: