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Which of the following best explains why photosynthesis is called an oxidation-reduction process?

  • (a) CO2 is oxidised to O2 and water is reduced to sugar. Your answer
  • (b) Chlorophyll is oxidised permanently and is not restored. Your answer
  • (c) Glucose is oxidised to CO2 and O2 is reduced to water. Your answer
  • (d) Water is oxidised to O2 and CO2 is reduced to carbohydrate. Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

In photosynthesis, water is oxidised to O2 (it loses electrons), and CO2 is reduced to carbohydrate (it gains electrons and hydrogen). So it is an oxidation-reduction process.

Why the other options are wrong

  • (a) · your answer This reverses the roles of CO2 and water.
  • (b) · your answer Chlorophyll is oxidised but is restored by electrons from water.
  • (c) · your answer This describes respiration.
NCERT point: Photosynthesis is a redox process driven by light.
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