(c)How do tropisms differ from nasties (or nastic movements)?

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Solution

Tropic movement
Nastic movement

1. The tropic movement shows the directional movement of a plant part with respect to the direction of the stimulus.

1. The nastic movement shows the non-directional movement of the plant part with respect to the direction of the stimulus.

2. All tropisms are growth movements but all nastic movements are not growth movements.

2. Nastic movements may or may not be growth movements.

3. The tropic movements of plants are induced by stimuli such as light, gravity, water, chemical, and touch.

3. The nastic movements of plants are induced by stimuli such as heat, light, touch (or contact).

4. Example: Bending of plant stem towards light.
4. Example: The folding of leaves of a sensitive plant (Mimosa pudica) in response to touch.

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Tropic movement	Nastic movement
1. The tropic movement shows the directional movement of a plant part with respect to the direction of the stimulus.	1. The nastic movement shows the non-directional movement of the plant part with respect to the direction of the stimulus.
2. All tropisms are growth movements but all nastic movements are not growth movements.	2. Nastic movements may or may not be growth movements.
3. The tropic movements of plants are induced by stimuli such as light, gravity, water, chemical, and touch.	3. The nastic movements of plants are induced by stimuli such as heat, light, touch (or contact).
4. Example: Bending of plant stem towards light.	4. Example: The folding of leaves of a sensitive plant (Mimosa pudica) in response to touch.