EVERYDAY SCIENCE

Detailed explanation-1: -An external stimulus is a stimulus that originates from outside the organism. For example, light is an external stimulus.

Detailed explanation-2: -The plant responds to many types of external stimuli such as light, gravity, weather, and touch. The response of a plant is either positive (grow towards the stimulus) or negative (grow away from the stimulus). For example, phototropism is the plant’s response to stimulus, i.e. sunlight.

Detailed explanation-3: -External stimuli come from outside an organism and influence the organism’s behavior. Temperature, sound, light, and other organisms act as external stimuli and cause different responses in organisms.

Detailed explanation-4: -Stimuli can be external or internal. An example of external stimuli is your body responding to a medicine. An example of internal stimuli is your vital signs changing due to a change in the body.

Detailed explanation-5: -Examples of internal stimulus include hunger, thirst, and emotional states.