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What is meant by Respiration Quotient ...

What is meant by Respiration Quotient (RQ) ? When will the value of RQ be 1 and when will it be less than 1 ?

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(i) R.Q. is the ratio of volume of `CO_(2)` produced to the volume of `O_(2)` used.
(ii) R.Q. is 1 when respiratory substance is glucose, while it is less than 1 when respiratory substrate is fat or protein.
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