Write any three differences between nastic and tropic movements in plants. [3 Marks]

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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.

Example- opening and closing of flowers (photonastic response).

Example – Phototropic response.

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Compare the nastic and tropic movements in plants.

Differentiate between tropic and nastic movements in plants.

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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.
Example- opening and closing of flowers (photonastic response).	Example – Phototropic response.