The volume of CO2 evolved in respiration is equal to the volume of O2 consumed, then the respiratory substrate is
A
Protein
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B
Carbohydrate
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C
Organic acid
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D
Fat
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Solution
The correct option is BCarbohydrate When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of CO2 and O2 are evolved and consumed.