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In short day plants, flowering is induced by

1. photoperiod less than 12 hours
2. photoperiod below a critical length and uninterrupted long night
3. long night
4. short photoperiod and interrupted long night

Correct answer: photoperiod below a critical length and uninterrupted long night

Solution

Short-day plants flower when the day is shorter than a critical length, which means the night is correspondingly long. The night must remain uninterrupted because even a brief light exposure can prevent flowering.

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