A student conducted an experiment using the setup below. Overall, what was the plantâs response an example of ?
(1) Gravitropism
(2) Nastic response
(3) Phototropism
(4) Thigmotropism
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they response phototropism
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The answer is option (3). The shown plant movement is due to phototropism, which is the movement towards light. Why do plants move towards light? It is because they need light for the process of photosynthesis. Phototropism occurs in plants and fungi. This movement of the plant is controlled by a chemical called 'Auxin', due to which the cells farthest away are elongated towards the light and the plant bends.
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