Question

5 difference between tropism and nastic movement

Answer 1

→ Nastic movements are non directional responses to stimuli such as temperature and heat.
→ The most important feature of this type of movement is that movements are not governed by the direction of the stimulus.
→ They may be induced by touch (seismonastic), temperature (Thermonastic), light, and chemicals.
→ Whatever be the direction of stimulus, the movements always occur in a particular direction without reference to the direction of the stimulus
→ Example of seismonastic movement is movement of Venus fly trap.


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→ 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 . If the movement of the plant part is away from the stimulus, then it is known as negative tropism .
→ For example phototropism, Geotropism etc.
Tropisms and nastic movements are both plant responses to external stimuli. however tropisms are depend on the direction of the stimulus nastic movements do not depend on the direction of a stimulus

Answer 2

hey there ,

tropism is found virtually in all plants but nastic movements are mostly found in speacailaised organs and plants .

both tropic and nastic movement are influenced by environment.

in tropism there is directional movement of plant in response to the surrounding like gravity or light but the direction of nastic movement is independent .

in tropism stimulus controls the orientation of the growth , in nastic movements stimulus triggers response .

in tropism the effect is more or less permanent but in nastic movements the effect is temporary and reversible .

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