AP BIOLOGY

Detailed explanation-1: -Tropisms are growth toward or away from a stimulus. Types of tropisms include gravitropism (gravity), phototropism (light), and thigmotropism (touch).

Detailed explanation-2: -Light is an important environmental stimulus that exerts a powerful influence on physiology and behavior across multiple timescales.

Detailed explanation-3: -Stimuli come in many forms, but are usually the result of an energy source, such as light or sound, or a natural force, such as gravity.

Detailed explanation-4: -Some common plant stimuli include light, gravity, water, movement of the sun, and touch. The naming of the tropism is associated with the stimulus. For example, the movement of plant roots towards water is called hydrotropism.