Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was most likely caused by an

  • [AIIMS 2009]
  • A

    unequal distribution of auxin in the stem.

  • B

    unequal distribution of a neurotransmitter in the stem.

  • C

    equal distribution of auxin in the stem.

  • D

    equal distribution of a neurotransmitter in the stem.

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