A) 640 nm
B) 680 nm
C) 720 nm
D) 620 nm
Correct Answer: B
Solution :
When \[{{P}_{r}}\] absorbs red light (660-665 nm) it is converted into \[{{P}_{fr}}\] form and when \[{{P}_{fr}}\] absorbs far red light (730-735 nm) it V converted into \[{{P}_{r}}\] form.
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