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Question

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

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

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.

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