Question

what do you understand by the term stimulus state two examples to show how living beings respond to stimuli

Answer 1

The changes in the surrounding to which living things respond are called stimuli. The living things show response to external stimuli such as heat, light , touch, sound, smell, taste, water and chemicals. ... Bright light is the stimulus and we respond by shutting the eyes momentarily. Animals also respond to stimuli.

Answer 2

Stimulus is the unwanted and external sensation received by our body which initiates a chemical reaction inside the body to produce an accurate response.
Examples:- when we touch a hot pan our hand /finger receives a stimulus and the signals travel through reflex arc to the spinal cord and the appropriate response to withdraw the hand to cause least damage.
Another example is when we hurt ourselves, the pain is the stimulus and the brain thinks an appropriate reaction that is to control the loss of blood .