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In photosynthesis, there is

  • (a) reduction of H2O Your answer
  • (b) oxidation of H2O Correct
  • (c) oxidation of CO2 Your answer
  • (d) reduction of O2 Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

In photosynthesis water is oxidised (it loses electrons and releases O2), and CO2 is reduced to sugar.

Why the other options are wrong

  • (a) · your answer Water is oxidised, not reduced.
  • (c) · your answer CO2 is reduced, not oxidised.
  • (d) · your answer O2 is a product; it is not reduced.
NCERT point: Photosynthesis is an oxidation-reduction (redox) process.
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