Question

Which one shows red $rightleftharpoons$ far-red interconversions?

• A. Carotenoids
• B. Cytochromes
• C. Chlorophylls
• D. Phytochrome

Answer 1

The correct option is D Phytochrome

Phytochromes are photoreceptor found in plants that detects light. The different phytochromes are involved in different biological responses to red light. P${}_r$ is inactive form whereas P${}_{fr}$ is an active form of phytochrome. When exposed to red light, P${}_r$ is converted to P${}_{fr}$. This active form then initiates many biological processes in plants.

Thus, the correct answer is option D.