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Caption: Phototropism. Seedlings growing towards a window. Plant growth towards a light source is known as positive phototropism. The plant hormone auxin causes cells on the side of the stem that is furthest from the light to elongate. This causes the bending of the stem towards the light.

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Keywords: auxin, bending, biological, biology, black background, botanical, botany, darwin's experiment, darwins experiment, daylight, experiment, external stimulus, flora, growing, hormonal, light, monocot, monocotyledon, nature, phototropic, phototropism, plant, plant hormone, positive phototropism, response, school science, seedling, seedlings, shoot, stem, sunlight, triticum sp, tropism, wheat, window

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