MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
In which stage of respiration are four molecules of CO2 produced?
Think it through first, then pick an option.
- a Glycolysis
- b Acetyl Co-A
- c Krebs cycle
- d Electron transport system
Answer and explanation
Correct answer: c Krebs cycle
The Krebs cycle gives 4 molecules of CO2 from one glucose.
Why the other options are wrong
- a Glycolysis: Glycolysis makes no CO2; it makes pyruvic acid.
- b Acetyl Co-A: The acetyl Co-A stage releases 2 CO2, not 4.
- d Electron transport system: The electron transport system releases no CO2.
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