alleryWheat is a long-day plant, which means it flowers when
Aday length exceeds a critical threshold
Bday length is shorter than a critical threshold
Cit is exposed to red light at midnight
Dthe soil temperature drops below 4°C
Answer & Solution
Correct answer: A. day length exceeds a critical threshold
Long-day plants like wheat, henbane and spinach flower when the day length is longer than a critical threshold (equivalently, the night is shorter than a critical limit).
Short-day plants flower when day length is below threshold.
Day-neutral plants don't depend on photoperiod.
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