Question

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

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

Answer 1

The correct option is C 680 nm

The Pr form absorbs light between 660 and 680 nm and absorbs at a peak of 666 nm. The Pr form is the inactive form of phytochrome. When Pr absorbs red light, it is activated and converted into the Pfr form.