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van Niel's general equation of photosynthesis is 2H2A + CO2 → 2A + CH2O + H2O. In green plants, H2A and A are, respectively,

  • (a) H2O and O2 Correct
  • (b) H2S and S Your answer
  • (c) CO2 and O2 Your answer
  • (d) glucose and CO2 Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

In green plants, the hydrogen donor H2A is water (H2O), and the oxidised product A is oxygen (O2).

Why the other options are wrong

  • (b) · your answer H2S and S apply to purple and green sulphur bacteria.
  • (c) · your answer CO2 is the substrate reduced, not the hydrogen donor.
  • (d) · your answer Glucose is the product, not the donor.
NCERT point: Equation for plants: 2H2O + CO2 → O2 + CH2O + H2O.
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