Movement of plant part in response to touch is ?

Seismonasty

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Photonastic

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Nutation

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None of the above

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Solution

The correct option is A Seismonasty
Seismonasty is defined as the nastic movement in response to shock, especially rapid folding of the leaflets of the sensitive plant due to changes in turgor pressure caused by vibration. It is also called as thigmonasty, because the external stimuli is touch.
So, the correct answer is 'Seismonasty'

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