Join WhatsApp ChannelDaily MCQs & Exam Updates
Biology Easy FPSC PPSC NTS Uploaded: 14 Jul 2026

Which gas is released by organisms as a byproduct of cellular respiration?

  • A Carbon dioxide
  • B Oxygen
  • C Nitrogen
  • D Hydrogen
Correct Answer: Option A — Carbon dioxide
Explanation:
Carbon dioxide is released as a byproduct of cellular respiration when glucose is broken down to produce ATP and must be exhaled by animals or used by plants in photosynthesis.
14 views Back to Biology
Submitted by: PaperMCQs
Related MCQs