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The unidirectional movement or growth of a whole part of a plant towards the direction of stimuli are known as nastic movements.
Ipomea alba opens in the day and closes during the night.
The non-directional movements of a plant or its part in response to the stimulus are known as nastic movements.
Nastic movement is a phenomenon that differs from the tropism as these are responses that are dependent on the direction of the stimulus.
When a plant develops from a seed, the root of the growing plant tends to move towards the area of water. This is due to geotropism.
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