A) more than its critical day length
B) less than its critical day length
C) equal to its critical day length
D) slightly less than its critical day length
Correct Answer: A
Solution :
Long day plants flower when the day length exceeds a certain critical duration in a 24 hour cycle, eg, wheat. The plants which flower when the day length is less than a certain critical duration in a 24 hour cycle are called short day plants, eg, Chrysanthemum morifolium.
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