what is the working of ganong's potometer
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A potometer (from Greek ποτό = drunken, and μέτρο = measure), sometimes known as a transpirometer, is a device used for measuring the rate of water uptake of a leafy shoot. The causes of water uptake are photosynthesis and transpiration.
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Limitations. The potometer does not measure the rate of transpiration accurately because not all of the water that is taken by the plant is used for transpiration (water taken might be used for photosynthesis or by the cells to maintain turgidity). The potometer measures the rate of uptake of water.
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