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The sunflower always bends towards sunlight because of Phototropic movement. This is due to presence of auxin ( A growth harmone ) in the stem . The higher concentration of auxin in the shaded side causes that side to grow faster,resulting in a positive phototropic curvature.
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facing of sunflower towards sun is called as phototropic movement.this is due to auxin , a growth harmone in stem ..the higher concentration of auxin in the shaded side cause that side to grow faster , resulting in a positive phototropic curvature .
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