A potometer is a device used for measuring the rate of water uptake of a leafy shoot. The causes of water uptake are photosynthesis and transpiration.
There are two main types of potometers used. The mass potometer consists of a plant with its root submerged in a beaker. The mass potometer measures the water lost through evapotranspiration of the plant and not the water taken up by the plant.
@B What is evapotranspiration?
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