Question
What are nastic movements ? Explain with examples.
✓
Answer
Nastic movements : In this a plant part show response to environmental stimuli. Unlike tropic movements, the direction of response is independent of direction of the stimulus. Leaves and petals show these type of movements caused
by external stimuli like touch, light and temperature. Different types of nastic movements are :
(a) Seismonastic movement : When the leaves of touch me- not, are touched they droop down from any side. This type of nastic movements is called seismonastic movements.
(b) Photonastic movements : The opening of leaves leaflets or petals in the morning when the sunlight appears is called photonastic movements.
(c) Nyctinastic movements : The drooping of leaflets of some plants in the evening is called nyctinastic movement
by external stimuli like touch, light and temperature. Different types of nastic movements are :
(a) Seismonastic movement : When the leaves of touch me- not, are touched they droop down from any side. This type of nastic movements is called seismonastic movements.
(b) Photonastic movements : The opening of leaves leaflets or petals in the morning when the sunlight appears is called photonastic movements.
(c) Nyctinastic movements : The drooping of leaflets of some plants in the evening is called nyctinastic movement
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