Assertion : Glucose is the favoured respiratory substrate. Reason: When glucose is used as respiratory…
Assertion : Glucose is the favoured respiratory substrate.
Reason: When glucose is used as respiratory substrate and is completely oxidized, the RQ is 1 .
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Solution
(a): 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.
$\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+6 \mathrm{O}_2 \longrightarrow 6 \mathrm{CO}_2+6 \mathrm{H}_2 \mathrm{O}+$ Energy
$\mathrm{RQ}=\frac{6 \mathrm{CO}_2}{6 \mathrm{O}_2}=1.0$