Question
Biology Question on Photosynthesis in higher plants
Which pigment absorbs the red and farred light
A
Cytochrome
B
Phytochrome
C
Carotenoids
D
Chlorophyll
Answer
Phytochrome
Explanation
Solution
A light-sensitive pigment found in some bacteria, fungi, and plants is called phytochrome. There are two interchangeable variants of it: Pr and Pfr. Pfr reflects far red light with a wavelength of 730 nm. It transforms back into its native state, Pr, when it absorbs far red light. Therefore, Pfr is the phytochrome's active form, which prevents blooming.