Question
Biology Question on Plant Growth Regulators
The wavelength of light absorbed by Pr form of phytochrome is
A
680 nm
B
720 nm
C
620 nm
D
640 nm.
Answer
680 nm
Explanation
Solution
Phytochrome is the photoreceptor pigment that controls flowering. It has two forms as P and Pfr. Pr is bluish phytochrome and it absorbs light at 660 to 680 nm of wavelength. P is (far red) yellowish green and absorbs light at 730 nm of wavelength.