AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -The stimulus can be in the form of taste, touch, light, gravity or pressure. Feeling of the weight of the bag of books is not the example of stimulus.

Detailed explanation-3: -Light, water and touch are all examples of stimuli. The closing of leaves and bending of shoots are responses to stimuli.

Detailed explanation-4: -○ Phototropism-The way a plant grows or moves in response to light. ○ Gravitropism-The way a plant grows or moves in response to gravity; also called geotropism. ○ Hydrotropism-The way a plant grows or moves in response to water. ○ Thigmotropism-The way a plant grows or moves in response to touch.