Question
Phytochrome
Answer :
Word Count : 241
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Phytochrome is a photoreceptive pigment found in plants that plays a central role in regulating growth and development in response to light. It exists in two interconvertible forms: Pr, which absorbs red light at a wavelength of around 660 nm, and Pfr, which absorbs far-red light at approximately 730 nm. Pr is considered the inactive form, while Pfr is biologically active and initiates various physiological responses. The conversion between these two forms allows plants to detect light quality, quantity, and duration, thus influencing processes such as seed germination, stem elongation, leaf expansion, and flowering. Phytochrome-mediated responses
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