Reduction in photosynthesis is of____________?

Correct answer: B. CO2

  • A. O2
  • B. CO2
  • C. H2O
  • D. light energy

Explanation

In photosynthesis, carbon dioxide is reduced to carbohydrates because it gains hydrogen or electrons supplied through the light reactions. Students may choose oxygen because water is split and oxygen is released, but oxygen is a product of oxidation of water, not the substance being reduced.

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