Question

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

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

Solution

## The correct option is B 680 nmLight 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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