Question

what is stimuli class 9 science samacheer kalvi​

Answer 1

Answer:

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A stimulus is a change in the external or internal environment which brings about a physiological response i.e when applied on any sensory receptor it elicits action or response. A stimulus may be internal stimuli (such as changes in blood pressure) or external stimuli (such as touch, sound, smell, taste, vision, etc.)

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Answer 2

Answer:

In physiology, a stimulus is a detectable change in the physical or chemical structure of an organism's internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity.

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