Botany - Respiration in Plants Question with Solution | TestHub

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. $\begin{array}{c}{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6+6{\mathrm{O}}_2\to 6{\mathrm{CO}}_2+6{\mathrm{H}}_2\mathrm{O}+\text{ Energy }\\ \mathrm{RQ}=\frac{6{\mathrm{CO}}_2}{6{\mathrm{O}}_2}=1\end{array}$