Ques. 1AIPMT 2001
Proteinaceous pigment which controls the activities concerned with light is
- Carotenoids
- Phytochrome
- Chlorophyll
- Anthocyanin
Answer
(2) Phytochrome
Solution
Phytochrome is a blue-green chromoprotein (protein + pigment) which absorbs red and far-red light and exists in two interconvertible forms, Pr and Pfr.
⇒ It controls light-dependent activities such as photoperiodic flowering, seed germination and photomorphogenesis.
∵ Carotenoids, chlorophyll and anthocyanin are non-protein pigments.
∴ The proteinaceous pigment is phytochrome.
Answer: (2)