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Question

Incomplete breakdown of sugars in anaerobic respiration forms

A
Glucose and CO2.
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B
Alcohol and CO2.
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C
Water and CO2.
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D
Fructose and water.
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Solution

The correct option is B Alcohol and CO2.
During the process of respiration glucose is broken down into pyruvic acid during the process of glycolysis. No oxygen is consumed nor any molecule of carbon dioxide is released in the process. The pyruvic acid molecule can be completely oxidised to carbon dioxide and water or incompletely oxidised to produce ethanol and carbon dioxide (alcohol fermentation) or lactic acid (lactic acid fermentation).

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