Phototropism

Phototropism

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Credit: Martin Shields/SCIENCE PHOTO LIBRARY

Caption: Phototropism is a directional plant response to light. Plant shoots (stems) exhibit positive phototropism by growing towards a light source. This sunflower seedling, Helianthus annuus, is bending towards the sun because auxin hormones released into the far (dark) side of the stem cause elongation on that side.

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Keywords: auxin, bending, bending toward light, biology, botany, growth and development, helianthus annuus, heliotropism, hormonal, hormone, in window, leaning, light, photo tropism, phototropic response, phototropism, plant, plant development, plant growth, positive phototropic response, positive phototropism, response, response to light, response to sunlight, seedling, shoot, stem, sunflower, sunlight, tropism, window, window sill, windowsill

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