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Biology Easy FPSC PPSC NTS Uploaded: 14 Jul 2026

Which gas is released by plants as a byproduct of photosynthesis?

  • A Carbon dioxide
  • B Nitrogen
  • C Oxygen
  • D Water vapour
Correct Answer: Option C — Oxygen
Explanation:
Oxygen is released as a byproduct of photosynthesis during the light-dependent reactions when water molecules are split through photolysis providing electrons to replace those lost by chlorophyll.
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