<Ul> <Li> A length of capillary tube A bubble is introduced to the cis taken up by the plant, the bubble moves . By marking regular gradations on the tube, it is possible to measure water uptake . </Li> <Li> A reservoir . Typically a funnel with a tap; turning the tap on the reservoir resets the bubble . Some designs use a syringe instead . </Li> <Li> A tube for holding the shoot . The shoot must be held in contact with the water; additionally, the surface of the water should not be exposed to the air . Otherwise, evaporation will interfere with measurements . A rubber bung greased with petroleum jelly suffices . </Li> </Ul> <Li> A length of capillary tube A bubble is introduced to the cis taken up by the plant, the bubble moves . By marking regular gradations on the tube, it is possible to measure water uptake . </Li> <Li> A reservoir . Typically a funnel with a tap; turning the tap on the reservoir resets the bubble . Some designs use a syringe instead . </Li> <Li> A tube for holding the shoot . The shoot must be held in contact with the water; additionally, the surface of the water should not be exposed to the air . Otherwise, evaporation will interfere with measurements . A rubber bung greased with petroleum jelly suffices . </Li>

What is the function of the reservoir in a potometer
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