Photosynthesis is a process in which:
Correct answer: D. Both B and C
- A. Oxidation of CO2 occurs
- B. Oxidation of H2O occurs
- C. Reduction of CO2 occurs
- D. Both B and C
Explanation
Option D is correct because photosynthesis is a redox process that encompasses both the oxidation of water and the reduction of carbon dioxide. During this process, water molecules are oxidized, meaning they lose electrons, which are then utilized in reducing carbon dioxide to form glucose. This is represented by the chemical equation:6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂Option A is incorrect since carbon dioxide undergoes reduction, not oxidation. Option B correctly identifies the oxidation of water, while Option C correctly identifies the reduction of carbon dioxide. However, only Option D captures the complete process of photosynthesis as involving both oxidation and reduction.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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