What is meant by stimulus and reaction?
Stimulus is the change in the environment or environmental factors to to which the organism can respond or react. Theresponse shown by organisms towards or awaya stimulus is called reaction.
What is reflex arc? Sketch a figure showing the reflex arc and reflex action produced when a person suddenly touches a burning candle.
A reflex arc is a pathway followed by the sensory and motor nerves in a reflex action.