AP BIOLOGY

Detailed explanation-1: -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-2: -Environmental factors, including light, chemical nutrients, water, and gravity are stimuli that can provoke tropisms in a plant. The plant grows in the direction of the stimulus as hormones inside the stem, root, and leaf systems in a plant aid in the elongation and growth process of the plant toward the stimuli.

Detailed explanation-3: -Like all organisms, plants detect and respond to stimuli in their environment. Their main response is to change how they grow. Plant responses are controlled by hormones. Some plant responses are tropisms.

Detailed explanation-4: -A change in an organism’s surroundings that causes the organism to react is called a stimulus (plural stimuli).