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What causes plants to respond positively to sunlight?

User GScrivs
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Auxin causes plants to respond positively to sunlight because these are chemicals in plants that are far from a light resource, which causes the plant to bend towards the sun.
User Abelyao
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Auxin. Cells on the plant that are farthest from a light source have a chemical called auxin cause the cells to elongate. The plant bends towards the light.
User SimonRH
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