Concept:Nastic movements are non-directional plant responses to external stimuli.
Explanation:Plants can move in response to external stimuli such as light, temperature, or touch.
When the movement depends on the direction of the stimulus, it is called tropism or taxism.
However, when the movement occurs without regard to the direction of the stimulus, it is a nastic movement.
Examples include the folding of leaves in a sensitive plant when touched.
Therefore, the movement described in the question is best classified as nastic movement.
Answer:D. nastic movement