4. Why photosynthesis is an oxidation reduction process?
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Water is oxidized in photosynthesis, which means it loses electrons, and carbon dioxide is reduced, meaning it gains electrons.
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It seems counterintuitive that carbon dioxide, the compound that's reduced in photosynthesis, gains electrons. This electron transfer is called reduction because the addition of negatively charged electrons reduces the overall charge of the molecule; that is, it makes the molecule less positive and more negative.
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