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MHT CET Medical202622 April 2026Evening ShiftBiologyRespiration in PlantsActual

Which one of the following respiratory reactions does NOT yield CO ₂ ?

Options

  1. APyruvic acid Acetyl Co.A
  2. BPyruvic acid Acetaldehyde
  3. CPyruvic acid Lactic acid
  4. DPyruvic acid Ethanol

Correct answer

C. Pyruvic acid Lactic acid

Step-by-step solution

In the conversion of pyruvic acid to acetyl CoA (link reaction), oxidative decarboxylation takes place, releasing CO ₂ . In alcoholic fermentation, pyruvic acid is first converted to acetaldehyde, releasing CO ₂ , which is then reduced to ethanol. Thus, the overall conversion of pyruvic acid to ethanol also yields CO ₂ . In lactic acid fermentation, pyruvic acid (a 3-carbon compound) is directly reduced to lactic acid (also a 3-carbon compound) by the enzyme lactate dehydrogenase. Since there is no loss of carbon a

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