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      Question

      How much photoperiod (hours) is required by long day

      plants?
      A <10 hours Correct Answer Incorrect Answer
      B >14 hours Correct Answer Incorrect Answer
      C >18 hours Correct Answer Incorrect Answer
      D >20 hours Correct Answer Incorrect Answer

      Solution

      Long day plants flower only when the day length is longer than a certain critical period > 14 hours eg: include all the rabi season crops like wheat, barley. Sugarbeet, oats.

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