Movements of trichomes in Drosera are

Photonastic

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Thermonastic

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Thigmonastic

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Seismonastic

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Solution

The correct option is B Thigmonastic
Thigmonastic movements occur in some plants in response to tactile stimuli. The movements may be defensive or offensive-response to the touch of an herbivore interested in ingesting the plant or by contrast, in response to the touch of an insect that may serve as a potential meal for a carnivorous plant.
So, the correct answer is 'Thigmonastic'

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