Question
What is the difference between photonasty and thigmonasty?
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Answer
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Photonasty
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Thigmonasty
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The non-directional movement of a plant part (usually petals of flowers) in response to light is called photonasty.
Example: The opening and closing of petals of dandelion flowers in response to the intensity of light.
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The non-directional movement of a plant part in response to the touch of an object is called thigmonasty.
Example: In Mimosa pudica plant, the leaves fold up in response to touch.
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