Question
Give an account of Z-scheme involving non-cyclic and cyclic photophosphorylation.
Answer :
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The Z-scheme is a model that explains the flow of electrons during the light reactions of photosynthesis, specifically in non-cyclic photophosphorylation. It illustrates how light energy is used to drive electron transfer from water to NADP+, producing NADPH and ATP. The name "Z-scheme" comes from the shape of the electron flow diagram, which resembles the letter "Z." In non-cyclic photophosphorylation, two photosystems—Photosystem II (PSII) and Photosystem I (PSI)—work together. Light energy excites electrons in PSII, which are transferred to the primary electron acceptor. These electrons then move through an electron transport chain to PSI, releasing
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