A) short night
B) short day and uninterrupted long night
C) long days and interrupted night
D) long night
Correct Answer: D
Solution :
In short day plants flowering takes place when daylength is shorter than a certain critical period (i.e., a long night is required). Under photoperiod longer than a critical point, these plants will not show flowering. e.g., Xanthium strumarium. Long day plant flowering occurs when day length is longer than a certain critical period (i.e., a long day is required for flowering).
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