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The O2 released by the splitting of water

  • (a) combines with RuBP Your answer
  • (b) is used to make NADPH Your answer
  • (c) stays in the lumen and is used in the Calvin cycle Your answer
  • (d) is released into the atmosphere as a by-product Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

The O2 formed by splitting water is a by-product. It diffuses out of the chloroplast and the leaf into the atmosphere.

Why the other options are wrong

  • (a) · your answer O2 combining with RuBP is photorespiration, which is not the purpose of the O2 released.
  • (b) · your answer NADPH is made from NADP+, electrons and protons, not O2.
  • (c) · your answer O2 does not stay in the lumen and is not used in the Calvin cycle.
NCERT point: This O2 is the source of the oxygen in the atmosphere.
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