If R.Q. is less than 1.0 for a substrate in Ganong's respirometer, it would mean that

Carbohydrate are used as respiratory substrate.

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Organic acids are used as respiratory substrate.

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The oxidation of the respiratory substrate consumed more oxygen than the amount of

C O_{2}

released.

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The oxidation of the respiratory substrate consumed less oxygen than the amount of

C O_{2}

released.

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Solution

The correct option is D The oxidation of the respiratory substrate consumed more oxygen than the amount of $C O_{2}$ released.
R.Q. is respiratory quotient, which is defined as the ratio obtained by dividing the number of $C O_{2}$ molecules eliminated to that of $O_{2}$ molecules consumed. Thus, it is clear that if the ratio is less than 1, the amount of $O_{2}$ consumed is more than the amount of $C O_{2}$ eliminated.
RQ is less than one when respiration is aerobic but the respiratory substrate is either fat or protein because the lesser volume of carbon dioxide is produced in comparison to the volume of oxygen consumed.
So, the correct answer is 'The oxidation of the respiratory substrate consumed more oxygen than the amount of CO $_{2}$ released'.

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