The given diagram summarises the reactions of anaerobic respiration:
Correct answer: B. B.
- A. A.
- B. B.
- C. C.
- D. D.
Explanation
The correct answer is the formation of pyruvic acid from glucose. This step is known as glycolysis, which is the initial stage of both aerobic and anaerobic respiration. During glycolysis, glucose is broken down into two molecules of pyruvate, and ATP is produced. In anaerobic conditions, pyruvate can be further converted into either ethanol or lactic acid, but these subsequent steps do not produce ATP. Therefore, the only stage in anaerobic respiration where ATP is generated is during the formation of pyruvic acid from glucose.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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