AP BIOLOGY

Detailed explanation-1: -A change in an organism’s surroundings that causes the organism to react is called a stimulus (plural stimuli). An organism reacts to a stimulus with a response-an action or change in behavior. Another example is if you are cold, you shiver. The cold is the stimulus while the shivering is the response.

Detailed explanation-2: -Response : Response are any type of behavior of a living organism that results from a stimulus. Hence, the change in an organism resulting due to a stimulus is called response or reaction.

Detailed explanation-3: -The response of an organism, usually a plant, to an environmental stimulus is called a tropism. Some common plant stimuli include light, gravity, water, movement of the sun, and touch. The naming of the tropism is associated with the stimulus.