How do nastic movements differ from tropisms?

Question

Quizplus · Accepted Answer

Tropisms are directional responses to directional stimuli, meaning that the direction of the stimulus affects the direction of the response. For example, in phototropism, the plant bends towards the source of light. In contrast, nastic movements are non-directional responses to stimuli, meaning that the direction of the stimulus does not affect the direction of the response. For example, the leaves of the Venus flytrap close in response to touch, regardless of the direction of the touch stimulus.

How Do Nastic Movements Differ from Tropisms