Write three points of difference between nastic and tropic movements in plants.

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Solution

Nastic movements

Tropic movements

Non-directional response to stimulus.

Directional response to stimulus.

Independent on growth of the plant

Dependent on growth of the plant

Change in turgor pressure can induce change in movement

Independent of change in turgor pressure

Example - opening and closing of flowers (photonastic response)

Example - Phototropic response

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Nastic movements	Tropic movements
Non-directional response to stimulus.	Directional response to stimulus.
Independent on growth of the plant	Dependent on growth of the plant
Change in turgor pressure can induce change in movement	Independent of change in turgor pressure
Example - opening and closing of flowers (photonastic response)	Example - Phototropic response