A) short day plant
B) long day plant
C) day neutral plant
D) intermediate plant
Correct Answer: B
Solution :
Long day plants require light period of 14-16 hours for subsequent flowering. This distinctive feature of long-day plant is that long light period entirely prevents flowering but long nights interrupted by light, even briefly, cause the inhibitive effect of the night to be lost and the plants flower, eg, Hyosyamus niger (henbane), Spinacea (spinach), Beta vulgaris (sugarbeet), wheat, oat, radish, lettuce.
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