The principle of working of all potometers is

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(C) potometer is an apparatus used to measure the rate of water uptake by a cut shoot. It is based on the principle that the rate of water absorption

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Absorption is proportional to transpiration

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(C) potometer is an apparatus used to measure the rate of water uptake by a cut shoot. It is based on the principle that the rate of water absorption by a plant is approximately equal to the rate of transpiration. As the plant loses water through transpiration,it absorbs an equivalent amount of water from the potometer,which can be measured by the movement of an air bubble in the capillary tube.

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