A) green light
B) red light
C) blue light
D) white light
Correct Answer: B
Solution :
Phytochrome becomes active in red light. Phytochrome is a proteinaceous pigment found in low concentrations. It is found in the forms PR or PFR. PR has an absorption peak at 660 nm (red light) and PFR has an absorption peak at 730 nm (far red light).
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