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The equation for the splitting of water in photosynthesis is

  • (a) 6H2O → C6H12O6 + 3O2 Your answer
  • (b) 2H2O → 2H2 + O2 Your answer
  • (c) H2O → H+ + OH− Your answer
  • (d) 2H2O → 4H+ + O2 + 4e− Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

The splitting of water is written as 2H2O → 4H+ + O2 + 4e−. The electrons go to PS II, the protons stay in the lumen and O2 is released.

Why the other options are wrong

  • (a) · your answer This is not the reaction of water splitting; it wrongly makes glucose from water alone.
  • (b) · your answer Hydrogen gas is not released in photosynthesis.
  • (c) · your answer This is the ionisation of water, not its splitting in photosynthesis.
NCERT point: Photolysis supplies electrons for the light reaction and releases O2.
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