Question

(a) Name the three types of nerves which constitute the peripheral nervous system.
(b) What is the difference between a reflex action and walking?
(c) How do we detect the smell of an incense stick (agarbatti)?

Answer 1

(a) The three types of nerves which make up the peripheral nervous system are the spinal nerves, the cranial nerves and the visceral nerves.

(b)

Reflex action	Walking
A reflex action is an involuntary action that is a rapid and automatic response to stimuli.	Walking is a voluntary action that requires our thinking and is in our control.

(c) When the smell of the incense stick reaches our nose, the olfactory receptors present in our nose detect it and send this information to our brain in the form of electrical signals. The brain interprets this information as the smell of incense stick where it has been already stored.