AP BIOLOGY

Detailed explanation-1: -Plants respond to changes in the environment by growing their stems, roots, or leaves toward or away from the stimulus. This response, or behavior, is called a tropism .

Detailed explanation-2: -Plants respond to their environment in a variety of ways. 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.

Detailed explanation-3: -Stimulus in plants 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-4: -Tropisms are directional growth responses that occur in response to directional stimuli. Phototropism occurs when plants direct their growth towards or away from light.