What is the use of an air bubble in ganong's potometer?

Dear Student, 

Please find below the solution to the asked query: 

When the water is absorbed and taken up by the roots of plant,  the bubble starts moving. The rate of water uptake by the plant determines the distance travelled by the bubble.
 
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In that experiment, When the water is absorbed and?taken up by the roots of plant,the bubble starts moving.The rate of water uptake by the plant determines the?distance travelled by the bubble.so the role of bubble is just to determine the the rate of water taken up by plant.
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