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Question

On touching the leaves of Mimosa pudica, it droop down because of

A
Seismonasty
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B
Hydrotropism
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C
Chemonasty
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D
Thigmotropism
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Solution

The correct option is A Seismonasty
Thigmonasty or seismonasty is the nastic response of a plant or fungus to touch or vibration. Examples are many species in the leguminous subfamily, Mimosoideae, active carnivorous such as Dionaea and a wide range of pollination mechanisms.
So, the correct answer is 'Seismonasty'

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