Question

Write differences between Tropic and Nastic movement.
(2marks question)​

Answer 1

Answer:

Nastic movements differ from tropic movements in that the direction of tropic responses depends on the direction of the stimulus, whereas the direction of nastic movements is independent of the stimulus's position. The tropic movement is growth movement but nastic movement may or may not be growth movement.

Answer 2

Answer:

Tropic :

These are movements towards the stimulus.

eg : Phototropism i.e movement of plants towards sunlight due to hormone called auxins.

Nastic :

These movements are not associated with stimulus . They are performed by touch or immediate action to save their lives.

eg : Closing of leaves of Mimosa Pudica..

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