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Question

The wavelength of light absorbed by Pr form of phytochrome is _____


A
640 nm
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B
680 nm
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C
720 nm
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D
620 nm
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Solution

The correct option is B 680 nm
Light acts as a signal to initiate and regulate photoperiodism and photomorphogenesis. There are two light-sensing systems involved in these responses, the blue light-sensitive system and the red light-sensitive or phytochrome system. The action spectrum of the light needed for P$$_r$$ responses is at about $$680$$ nm.
So, the correct answer is '680 nm'

Biology

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