Photosynthesis Question 38
38. The wavelength of light absorbed by $Pr$ form of phytochrome is
(a) $680 nm$
(b) $720 nm$
(c) $620 nm$
(d) $640 nm$
Show Answer
Answer : a
Hints & Solution
(a) The Pr form absorbs light between 660 to $680 nm$ and absorbs at a peak of $666 nm$. It is the form synthesized in dark-grown seedlings. When Pr absorbs red light, it is converted to the Pfr form.
