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R.Q. is ratio of

1. CO₂ produced to substrate consumed
2. CO₂ produced to O₂ consumed
3. oxygen consumed to water produced
4. oxygen consumed to CO₂ produced

Correct answer: CO₂ produced to O₂ consumed

Solution

The respiratory quotient (RQ) is defined as the amount of CO₂ produced divided by the amount of O₂ consumed. This ratio helps indicate which substrate is being respired.

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