What precautions we should take in mind while using a Potometer ?
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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.
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Precautions while using a Potometer are -
1 ) The Potometer should be made completely water - tight .
2 ) The twig must be cut obliquely ( to allow larger surface for the water intake ) and under water to avoid suction of an air bubble into the twig which will stop the absorption of water into the Xylem .
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