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Investigation of the factors affecting the rate of transpiration from a shoot of Privet.  

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Biology planning exercise: investigation of the factors affecting the rate of transpiration from a shoot of Privet Introduction Transpiration is the evaporation of water from a plant, primarily from the leaves. This is because the undersides of the leaves have many small holes, called stomata, which are necessary for the absorption of carbon dioxide. Inside each stoma is an air space, and the surface of all the cells bordering that are coated with a thin film of water, in order to maximise the absorption of carbon dioxide. This inevitably means that some of the water evaporates - this is called transpiration. I intend to measure the rate of transpiration in a privet shoot (see preliminary work). However, it would not be very easy to directly measure the amount of water lost directly - the only way would be to measure relative humidity with the plant in an enclosed space, but humidity affects...

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