Question

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

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

Answer 1

The correct option is C $680nm$

The Pr form absorbs light between $660$ to $680nm$ and absorbs at a peak of $666nm$. It is the form synthesized in dark-grown seedlings. When Pr absorbs red light, it is converted to the $Pfr$ form.