Answer:
Sol. Sudden
action in response to something occurring in environment is known as reflex.
The sudden response by our body is met by reflex action involving the formation
of reflex arc.
A reflex action is defined as a spontaneous, automatic and mechanical
response to a stimuli without the will of an individual. (2)
Some examples of reflex actions are
(i) Watering of mouth at the sight or smell of good food.
(ii) Immediate with drawl of hand of a person if some hot
object is touched.
(iii) Blinking of eyes when a foreign particle enters it. Formation
of a reflex arc is shown in the pathway below
Stimulus
Receptors Sensory 
Response 
Effector Motor neuron (2)
The diagram showing reflex arc is given below
(1)
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