The flowers of Oxalis open during the day and close at night. Such type of movement is

Photonasty

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Nyctinasty

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Phototropic

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Seismonastic

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Solution

The correct option is A Photonasty
Photonasty is the response produced by plants in response to availability of light. So, the flowers which respond to light and open during the day and close at night are said to possess photonasty movement.
Hence, the answer is A.

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