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Plants and green algae optimize photosynthesis in changing light conditions by balancing the amount of light absorbed by photosystems Ⅰ and Ⅱ.These photosystems work in series to extract electrons from water and reduce NADP+ to NADPH.Light-harvesting complexes (LHCs) are held responsible for maintaining the balance by moving from one photosystem to the other in a process called state transitions.