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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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