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Question

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 B Carbohydrate
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.

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