General Science • BiologyHard
During the light-dependent reactions of photosynthesis, what is the source of electrons that replenish those lost by chlorophyll P680 in Photosystem II?
A. Carbon dioxide fixation
B. Photolysis of water molecules✓ Correct Answer
C. Reduction of NADP+ to NADPH
D. Oxidative phosphorylation in mitochondria
💡 Solution & Explanation
The photolysis, or light-driven splitting, of water molecules releases oxygen, protons, and electrons that replenish the electron vacancy in the reaction center chlorophyll P680 of Photosystem II. Carbon dioxide is utilized in the Calvin cycle within the stroma, NADP+ acts as the terminal electron acceptor in Photosystem I, and oxidative phosphorylation occurs during cellular respiration. This photolytic release of oxygen sustains aerobic life on Earth.
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