What do you understand by the term respiratory quotient?

Ratio of volume of

C O_{2}

evolved to the volume of

O_{2}

consumed in respiration

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Ratio of volume of

O_{2}

evolved to the volume of

C O_{2}

consumed in respiration

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Ratio of volume of

C O_{2}

consumed to the volume of

O_{2}

evolved in respiration

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Ratio of volume of

O_{2}

consumed to the volume of

C O_{2}

evolved in respiration

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Solution

The correct option is A Ratio of volume of $C O_{2}$ evolved to the volume of $O_{2}$ 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.

$C_{6} H_{12} O_{6} G l u c o s e + 6 O_{2} ⟶ 6 C O_{2} + 6 H_{2} O$

$R Q = \frac{6 C O_{2}}{6 O_{2}} = 1$

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