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The ATP formed in the light reaction is synthesised by

  • (a) RuBisCO Your answer
  • (b) PEP carboxylase Your answer
  • (c) ATP synthase Correct
  • (d) NADP reductase Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

ATP in the light reaction is made by ATP synthase (CF0-CF1) as protons flow from the lumen back to the stroma.

Why the other options are wrong

  • (a) · your answer RuBisCO fixes CO2; it does not make ATP.
  • (b) · your answer PEP carboxylase fixes CO2 in C4 plants.
  • (d) · your answer NADP reductase makes NADPH, not ATP.
NCERT point: CF0 is the proton channel; CF1 makes the ATP.
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