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The wavelength of light absorbed by Pr form of phytochrome is

1. 680 nm
2. 720 nm
3. 620 nm
4. 640 nm

Correct answer: 680 nm

Solution

Phytochrome exists mainly as Pr and Pfr. The Pr form absorbs red light, with a peak around 660–680 nm, which converts it to Pfr; among the options, 680 nm matches this absorption best.

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