When malic acid is the respiratory substrate:

The amount of

C O_{2}

released in more than the

O_{2}

consumed.

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The amount of

C O_{2}

released in less than the

O_{2}

consumed.

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The amount of

C O_{2}

released in equal to

O_{2}

consumed.

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C O_{2}

is not released.

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Solution

The correct option is A The amount of $C O_{2}$ released in more than the $O_{2}$ consumed.
Respiratory quotient (RQ) is the ratio of the volume of carbon dioxide evolved to that of oxygen consumed by an organism in a given time. It is the ratio of carbon dioxide produced to the oxygen consumed in a given time. When a lipid is a respiratory substrate, RQ value is 0.7. When a protein is a respiratory substrate, RQ value is 0.8. When carbohydrate is the respiratory substrate, RQ value is 1.0. When malic acid is the respiratory substrate, the RQ value is 1.33. In this, the amount of carbon dioxide released is more than the oxygen consumed.
Thus, the correct answer is 'The amount of CO $_{2}$ released in more than the O $_{2}$ consumed.'

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