IGNOU BBYCT 137 2026 - Phytochrome-mediated responses

Question

Phytochrome-mediated responses

31 Jan 2026

Answer :

Word Count : 258

Phytochromes are a class of photoreceptor proteins in plants that primarily absorb red (around 660 nm) and far-red (around 730 nm) light, playing a central role in regulating plant growth and development. They exist in two interconvertible forms: Pr, which absorbs red light, and Pfr, which absorbs far-red light. The Pr form is biologically inactive and converts to the active Pfr form upon absorption of red light, while Pfr can revert to Pr either slowly

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