Question

5 difference between tropic and nastic movt

Answer 1

Answer:

tropic movement

• growth depending
• slow
• move away or to the stimulus

nastic movement

• growth independent
• fast
• neither away or to the stimulus

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Answer 2

Answer:

Nastic movements are non directional responses to stimuli such as temperature and heat. ... → Tropic movement is the response to stimuli that comes from one direction. → It is a directional movement. → If the movement of the plant part is towards the stimulus, then it is known as positive tropism .

Tropic movements are paratonic movements of growth. Nastic movements are paratonic movements of variations.

2 Example: Movement of shoot towards the sunlight (phototropic movement). Drooping of the leaves of Mimosa pudica due to touch (Thigmonastic movement).

3 Tropic movements are shown by plant organs with radial symmetry (such as root and stem). Nastic movements are shown by plant organs with bilateral symmetrical (flat) such as leaves and stomata.

4 Stimuli for the tropic movements are unidirectional and never diffused. The stimuli for the nastic movements may be unidirectional or diffused.

5 The tropic movements are related to the direction of stimuli. Nastic movements are NOT related to the direction of stimuli.

6 Tropic movements are comparatively slow movements. Nastic movements are quick movements.

7 Tropic movements are caused by the cell divisions in the organ. The nastic movements are caused by the change in the turgor pressure of the cells in the organ.

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