When a photon of light energy reaches a reaction center of the chlorophyll molecules, an electron is excited.
The light reaction of photosynthesis is characterized by the absorption of photons of light by the photosystems of the chlorophyll. When this happens, an electron in one of the photosystems becomes excited and moves through the electron transport chain.
The energy emitted by the electron is used to generate energy-rich molecules in the form of ATP and NADPH while the space left by the excited electron is filled by another electron generated from the splitting of water molecules.
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