Which of the following treatments would cause cocklebur, a short day plant, to flower?
A) 16 hours of light; 7 hours of darkness
B) 12 hours of light; 8 hours of darkness
C) 12 hours of light; 10 hours of darkness
D) 12 hours of light; 8 hours of darkness, but the plants are exposed to red light for 10 minutes in the middle of the dark period
E) 12 hours of light; a 30 minute dark period in the middle of the light period; 8 hours of darkness
Correct Answer:
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