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The photochemical reactions in the chloroplast are directly involved in

  • (a) synthesis of glucose and its storage as starch Your answer
  • (b) formation of phosphoglyceric acid from RuBP Your answer
  • (c) photolysis of water and phosphorylation of ADP to ATP Correct
  • (d) fixation of carbon dioxide by RuBisCO Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

The photochemical (light) reactions split water (photolysis) and make ATP from ADP (photophosphorylation), along with NADPH. Sugar formation and CO2 fixation belong to the dark reactions.

Why the other options are wrong

  • (a) · your answer Glucose synthesis and starch storage come after the Calvin cycle; they are not photochemical.
  • (b) · your answer PGA is formed from RuBP in the Calvin cycle (dark reaction).
  • (d) · your answer CO2 fixation by RuBisCO is part of the dark reaction.
NCERT point: Light reactions: thylakoid membranes. Dark reactions: stroma.
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