Which of the following is not true for flowering?

  1. Only duration of dark period is important
  2. Certain plants depend not only on a combination of light and dark exposures but also their relative durations
  3. The site of perception for light or dark duration are the leaves
  4. There is a hormonal substance which migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.
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