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      Question

      Plants appear to bend towards light due to

      A Concentration of auxins at root tip Correct Answer Incorrect Answer
      B Concentration of auxins at shoot tip Correct Answer Incorrect Answer
      C Diffusion of auxins towards shady side of shoot Correct Answer Incorrect Answer
      D More than one of the above Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      Solution

      Plants bend toward light (phototropism) because of the uneven distribution of auxin, a plant hormone. When light strikes a plant, auxins move away from the illuminated side to the shaded side. The higher concentration of auxins on the shaded side causes those cells to elongate more than cells on the illuminated side, resulting in the plant bending toward the light source.

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