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  1. Which one is a long-day plant?
    1. Tobacco
    2. Glycine max
    3. Mirabilis jalapa
    4. Spinach
Correct Option: D

Long day plants undergo flowering after receiving light above a critical day length. e.g. Spinach, sugarbeet. Short day plants flower only when they receive light below a critical day length. e.g. Glycine max, Tobacco.



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