Which of the following is a long-day plant?

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(D) Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. Plants are classified based on their response t

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Spinach

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(D) Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. Plants are classified based on their response to photoperiods into three categories: Long-day plants,Short-day plants,and Day-neutral plants.$1$. Long-day plants $(LDP)$ flower when the day length exceeds a critical duration. Examples include Spinach ($Spinacia$ $oleracea$),Wheat,and Radish.$2$. Short-day plants $(SDP)$ flower when the day length is shorter than a critical duration. Examples include Tobacco and Glycine max (Soybean).$3$. Day-neutral plants flower regardless of the day length. An example is Mirabilis jalapa.Therefore,Spinach is a long-day plant.

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