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Electron transport system - class-XI

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Multiple Choice

Which statement is correct for given reaction for photosynthesis?
$2H _2A+CO _2\overset{light}{\rightarrow}2A+CH _2O+H _2O$.

  1. H donor is oxidisable substrate
  2. $O _2$ evolve from $H _2O$ if reducible compound is $H _2O$
  3. Glucose gain its oxygen from $H _2O$
  4. $(1)$ & $(3)$ both
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