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(B) The Respiratory Quotient $(RQ)$ is defined as the ratio of the volume of $CO_2$ evolved to the volume of $O_2$ consumed during respiration.$RQ = \

Vedclass · Accepted Answer

Organic acid

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(B) The Respiratory Quotient $(RQ)$ is defined as the ratio of the volume of $CO_2$ evolved to the volume of $O_2$ consumed during respiration.$RQ = \frac{	ext{Volume of } CO_2 	ext{ evolved}}{	ext{Volume of } O_2 	ext{ consumed}}$For carbohydrates like glucose, the $RQ$ is $1.0$.For fatty acids, the $RQ$ is less than $1.0$ (usually about $0.7$).For organic acids (e.g., malic acid, oxalic acid), the $RQ$ is greater than $1.0$ because they are oxygen-rich and require less external $O_2$ for complete oxidation.Therefore, when the volume of $CO_2$ evolved is more than the volume of $O_2$ consumed, the respiratory substrate is an organic acid.

When the volume of $CO_2$ evolved is more than the volume of $O_2$ consumed, the respiratory substrate must be .........

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