A) \[{{\operatorname{P}}_{730}}/{{P}_{Fr}}\]
B) \[{{\operatorname{P}}_{660}}/{{P}_{Fr}}\]
C) \[{{\operatorname{P}}_{700}}\]
D) \[{{\operatorname{P}}_{680}}\]
Correct Answer: A
Solution :
Phytochrome is a photoreceptive pigment which is a bright blue or bluish green pigment. Phytochrome occurs in 2 forms ie, \[{{P}_{R}}\] and \[{{P}_{FR}}\] (i.e, red light and for red light absorming forms) in which \[{{P}_{FR}}\] is the active form. \[{{P}_{R}}\] absorbs red light of 660 nm and \[{{P}_{FR}}\] absorbs far red light of 730 nm. Phytochrome affects many processes like stem elongation, leaf expansion, stomatal development, flowering and seed germination.
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