| Plants P and Q were studied for the effect of flashes of light on the flowering. For both P and Q, during 14 h dark period, flashes of light were given at different time intervals. The results are shown in the graph. Choose the correct statement from the following options. |
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A) P: Short day plant, sufficient \[{{\operatorname{P}}_{fr}}\] (in the Middle of the dark period)\[\to \] florigen
B) Q: Short day plant, sufficient \[{{\operatorname{P}}_{r}}\] (in the Middle of the dark period)\[\to \] florigen
C) P: Long day plant, sufficient \[{{\operatorname{P}}_{r}}\] (in the Middle of the dark period) \[\to \]florigen
D) Q: Long day plant, sufficient \[{{\operatorname{P}}_{fr}}\] (in the middle of the dark period) \[\to \]florigen
Correct Answer: D
Solution :
Plant P is short day plant as exposure to flashes of light lowered down flowering in it. Plant Q is a long day plant as flashes of light promoted flowering. On exposure to light during 14h long dark period, \[{{P}_{r}}\] is converted into \[{{P}_{fr}}\] In short day plants, \[{{P}_{r}}\] form builds up during night and activates florigen whereas in long day plants \[{{P}_{fr}}\]. form builds up during light hours and activates florigen. So, \[{{P}_{fr}}\]. Promotes flowering in long day plants and inhibits flowering in short day plants.
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