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If two molecules of water are split in the light reaction, the maximum number of NADPH molecules that can be formed is

  • (a) 1 Your answer
  • (b) 2 Correct
  • (c) 4 Your answer
  • (d) 8 Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Two water molecules give 4 electrons. Each NADPH needs 2 electrons, so at most 2 NADPH can be formed.

Why the other options are wrong

  • (a) · your answer Four electrons are enough for two NADPH, not one.
  • (c) · your answer Four NADPH would need 8 electrons.
  • (d) · your answer Eight NADPH would need 16 electrons.
NCERT point: 2H2O → 4H+ + O2 + 4e−.
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