AP BIOLOGY

Detailed explanation-1: -What are tropic and Nastic Movements? Tropic movements are directional responses to stimuli while nastic movements are non-directional responses to stimuli.

Detailed explanation-2: -Tropisms are directional movements or growth response of a plant to the stimulus. In nastic movements, the response of the plant is non-directional. An example of tropism is thigmotropism, which is a growth response to the touch stimulus.

Detailed explanation-3: -Thigmotropism is one example of tropism, which is the responding of a plant to environmental stimuli by growing towards or away from them. In other words, the reaction can be positive or negative. For instance, a stem can grow upwards towards the sun, and roots can grow away from an object in the soil.

Detailed explanation-4: -Nastic movements are non-directional responses to stimuli (e.g. temperature, humidity, light irradiance), and are usually associated with plants. The movement can be due to changes in turgor.

Detailed explanation-5: -Tropisms and nastic movements are both plant responses to external stimuli. however tropisms are depend on the direction of the stimulus nastic movements do not depend on the direction of a stimulus.