A) white or red light
B) far-red light
C) red light followed by far-red light
D) far red light, then red light and again by far red light
Correct Answer: A
Solution :
In short day plants, howering is inhibited interruption of darak by white or red light. A short day plant like, xanthium will not flower it the continuity of dark period is broken by flash of light for 1-2 minutes and flower only when dark period is above 9 hours.
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