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Question

What do you understand by the term respiratory quotient?

A
Ratio of volume of CO2 evolved to the volume of O2 consumed in respiration
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B
Ratio of volume of O2 evolved to the volume of CO2 consumed in respiration
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C
Ratio of volume of CO2 consumed to the volume of O2 evolved in respiration
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D
Ratio of volume of O2 consumed to the volume of CO2 evolved in respiration
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Solution

The correct option is A Ratio of volume of CO2 evolved to the volume of O2 consumed in respiration
Respiratory quotient is ratio of volume of carbon dioxide evolved to volume of oxygen consumed during respiration. Respiration involves the breakdown of different respiratory substrates. Based on the type of substrate involved in the process, the respiratory quotient (RQ) varies. For example RQ of carbohydrates is 1.

C6H12O6Glucose+6O26CO2+6H2O

RQ=6CO26O2=1

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