Bending of shoot of a plant towards light can be referred to as

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photonasty

positive phototropism

negative phototropism

photoperiodism

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This question was previously asked in

UPSC CAPF – 2019

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The correct answer is B, positive phototropism.

Phototropism is the growth of a plant in response to a light stimulus. When a plant shoot bends and grows towards the light source, it is exhibiting positive phototropism.

Photonasty is a non-directional plant movement in response to light intensity (e.g., opening and closing of flowers). Negative phototropism is growth away from a light source (e.g., roots). Photoperiodism is the physiological response of an organism to the length of day or night.

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