What is extinction point in respiration?

Dear student,
The point at which the minimum amount of oxygen can initiate aerobic respiration and the anaerobic respiration become extinct is called extinction point.
Regards,

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Extinction point: The point at which RQ value reaches unity at a certain oxygen concentration. At this point, the rate of aerobic respiration will be optimum while anaerobic respiration will be completely stopped.
The normal value of extinction point is 2
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