$I.Q.$ is the ratio of mental age to

Which of the following are the properties of the neural system?

In humans,rapid coordination of functional activities is achieved by which of the following?

Pioneer work on conditioned reflex was done by

The minimum time interval required between the application of a stimulus and the production of a response is known as:

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.