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(D) 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 = \

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Organic acid

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(D) 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 or sucrose,the $RQ$ is $1.0$.For fats,the $RQ$ is less than $1.0$ (approximately $0.7$).For organic acids (e.g.,malic acid or oxalic acid),the $RQ$ is greater than $1.0$ because they are oxygen-rich compounds,meaning they require less external $O_2$ for oxidation and release more $CO_2$ during the process.

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

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