During the Calvin-Benson cycle (carbon-fixing reactions), in the red Columbine plant, high-energy electrons are transferred into a newly made 3-carbon compound. Eventually these electrons will end up as part of glucose molecules. What was the original source of these electrons in photosynthesis?

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The original source of electrons in photosynthesis is water. During the light reactions of photosynthesis, water is split into oxygen, protons, and electrons. These electrons are then used to produce ATP and NADPH, which are used in the Calvin-Benson cycle to fix carbon dioxide and ultimately produce glucose.

During the Calvin-Benson Cycle (Carbon-Fixing Reactions), in the Red Columbine