Biology for IGCSE & O level - Respiration (Section 3 - No. 29)
In the apparatus used to measure the rate of respiration by yeast, what does the movement of the colored liquid indicate?
The amount of glucose being used.
The amount of oxygen being used.
The amount of lactic acid being produced.
The amount of heat being released.
Explanation
The movement of the coloured liquid shows the change in volume in the tube and therefore shows the oxygen used by the yeast.
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