Question

Differentiate between tropic and Nastic movements.

Answer 1

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➡️ when the stimulus has a particular direction and movement of plant occurs in the direction of this stimulus, this movement is called tropic movement

➡️ when the stimuli have no fixed direction, and have a diffused impact, then the movement of plant occurs irrespective of the direction of the stumuli. such movements are called Nastic movements

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Answer 2

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Here is your answer.........

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Tropic movements and Nasticmovements are the two types of inducedor paratonic movements of curvature in plants.

Tropic movements: 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 movements: 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.

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