Question

What are nastic and curvature movements give an example of each

Answer 1

the movement of plant towards the stimuli
example :- dropping of leaves

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Answer 2

Nastic movement are nondirectional paratonic movements of growth that are determined by the structure of the responding organ irrespective of the direction of stimulus which is generally diffuse.  example: haponasty  

Curvature movement are directional paratonic growth movements of curvature in which the direction of movement is determined by the direction of stimulus. Example - positive geotrophism in shoots