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Assertion: Glucose is the favoured respiratory substrate.
Reason : When glucose is used as respiratory substrate it is completely oxidised and RQ is 1 .
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Reason : When glucose is used as respiratory substrate it is completely oxidised and RQ is 1 .
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If both assertion and reason are true and reason is the correct explanation of assertion.
The ratio of the volume of $\mathrm{CO}_2$ evolved to the volume of $\mathrm{O}_2$ consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio.
$\mathrm{RQ}=\frac{\text { Volume of } \mathrm{CO}_2 \text { evolved }}{\text { Volume of } \mathrm{O}_2 \text { consumed }}$
The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1 , because equal amounts of $\mathrm{CO}_2$ and $\mathrm{O}_2$ are evolved and consumed respectively.
$\begin{gathered}\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2+6 \mathrm{H}_2 \mathrm{O}+\text { Energy } \\ \mathrm{RQ}=\frac{6 \mathrm{CO}_2}{6 \mathrm{O}_2}=1\end{gathered}$
$\mathrm{RQ}=\frac{\text { Volume of } \mathrm{CO}_2 \text { evolved }}{\text { Volume of } \mathrm{O}_2 \text { consumed }}$
The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1 , because equal amounts of $\mathrm{CO}_2$ and $\mathrm{O}_2$ are evolved and consumed respectively.
$\begin{gathered}\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2+6 \mathrm{H}_2 \mathrm{O}+\text { Energy } \\ \mathrm{RQ}=\frac{6 \mathrm{CO}_2}{6 \mathrm{O}_2}=1\end{gathered}$
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