Question

what are nastic movement?

Answer 1

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Nastic movements are non-directional responses to stimuli, and are usually associated with plants. The movement can be due to changes in turgor or changes in growth. 

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Answer 2

★What is Nastic Movement?
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The movement of a plant part in response to an external stimulus in which the direction of response is not determined by the direction of stimulus is known as Nastic movement. It is also known as Nasties. The stimuli may be classified as light, heat, touch or contact, etc. Nastic movement is not a directional movement of the plant part with response to the stimulus. 
In nastic movement, from whichever direction the stimulus is applied, it affects all the parts of the organ of a plant equally and they always move in the same direction. This movement takes place in the flat organs of the plant like leaves, petals of flowers etc.

★Examples of nastic movements are:
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• In the Mimosa pudica plant, when we touch the leaves of the plant they fold up. Here the stimulus is touch.

• In a dandelion flower, the opening up of the petals of this flower in the morning in bright light and closing in the evening when light fades. Here, the stimulus is light.
We can say that Nastic movement may or may not be a growth movement because we have seen above that folding up of the leaves of a sensitive plant on touching is not a growth movement but the opening and closing of petals of flowers is a growth movement.

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