what do you mean by phototropism
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Phototropism is the growth of an organism in response to a light stimulus. Phototropism is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs.
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The growth of the plant towards the direction of sunlight is known as Photoperiodism. This mainly takes place by bending of shoot towards sunlight. Charles Darwin conducted an experiment and proved that the hormone Auxin is responsible for bending of the shoot towards sunlight
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