What is mean by nastic movement

1.	What is mean by nastic movement
Answer» The directionless movements of plants caused due to the external variations in environment are termed as nastic movements.Various types of nastic movements are:i. Seismonsatic movements: The movement of a plant or its part in response to touch or any kind of shock. Example - the folding or drooping of leaves of ‘touch-me-not’ plant.ii. Nyctinastic movements: The movements of plants that occur in response to presence or absence of light (photonastic movements) or variation in temperature (thermonastic movements). The non directional movement of plants part is called nastic movement Non directional response to the external environment which may or may not be growth movements r called nastic movement.

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