Solar energy is used to excite electrons in which phases of photosynthesis?Group of answer choicesPhotosystem IPhotosystem IICalvin CyclePhotosystem I and Calvin CyclePhotosystem II and Photosystem I
Question
Solar energy is used to excite electrons in which phases of photosynthesis?Group of answer choicesPhotosystem IPhotosystem IICalvin CyclePhotosystem I and Calvin CyclePhotosystem II and Photosystem I
Solution
Solar energy is used to excite electrons in Photosystem II and Photosystem I. These are the two main parts of the light-dependent reactions of photosynthesis. In Photosystem II, light energy is absorbed by chlorophyll and other pigments, exciting electrons that are then passed along an electron transport chain. In Photosystem I, these electrons are re-energized by light energy and used to produce NADPH, a high-energy carrier molecule. The Calvin Cycle, on the other hand, is a light-independent process and does not directly use solar energy to excite electrons.
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