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Which one of the following products diffuses out of the chloroplast during photosynthesis?

  • (a) O2 Correct
  • (b) NADPH Your answer
  • (c) ATP Your answer
  • (d) ADP Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Oxygen, released when water is split, diffuses out of the chloroplast and the cell. ATP and NADPH stay in the stroma and are used in the Calvin cycle.

Why the other options are wrong

  • (b) · your answer NADPH is used inside the stroma for the Calvin cycle; it does not leave the chloroplast.
  • (c) · your answer ATP made in the light reaction is used within the chloroplast stroma.
  • (d) · your answer ADP returns to the thylakoids to be made into ATP again; it does not diffuse out.
NCERT point: Products of the light reaction: ATP, NADPH and O2. Only O2 leaves the chloroplast.
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