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difference between trophic and nastic movements with examples of each

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DIFFERENCE BETWEEN TROPIC AND NASTIC MOVEMENT:

TROPIC MOVEMENT: The paratonic (induced) movement of growth is called tropic movements. Here the stimuli are external and unidirectional. Example: phototropic movements (movement towards the light) geotropic movements (movement towards gravity), chemotropic movements (movement towards chemicals) etc.

NASTIC MOVEMENT: The paratonic movements of variations are called nastic movements. Here the stimuli are external and diffused (not unidirectional). Example: nyctinastic movements (movements in response to darkness), Seismonastic movements or Thigmonastic movements (movements in response to touch) etc.