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An investigation into the factors which affect the rate of transpiration

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An investigation into the factors which affect the rate of transpiration Aim: In this investigation I will be investigating how wind speed affects the rate of transpiration in plants. I have decided to experiment with wind speed because in preliminary tests it proved to be a fair variable and easily controlled. Quantitative prediction: I think that when the wind speed is doubled the rate of transpiration will also double. I think this because as the wind speed increases so must the amount of water that is blown off the leaf, so more water will be taken up increasing the rate of transpiration. Theory: Transpiration is the loss of water from plant leaves (from spongy cells to air spaces and out through the stomata). ...read more.


I decided to do this as it is easier to regulate than speed. I have decided these positions will be 10, 20, 30, 40, 50, 60, and I will do each test 3 times and find the averages to make it a fair test. I will also have to make sure that the hairdryer is put at these points and at regular points so it wont affect my results. Apparatus list: In this experiment I will need the following: Potometer to carry out the tests, Thermometer so I can ensure the water is kept the same temperature and that the room temp is kept constant and if not compensate for that, a Hairdryer for imitating my wind, Vaseline to make sure that the potometer is fully water tight, Scalpel to cut the stem of the plant, ...read more.


This, along with the colouring will enable us to see the rate at which the plant transpires. Record how long it takes for the air bubble to reach a certain place within the different wind speeds. If necessary hold the potometer with a clamp stand to make sure no unwanted air enters the tubes. Set up the hairdryer at regular intervals, making sure that it is always on the cool setting so only one factor is changed at one time. Check that light intensity and the room temperature is kept as consistent as possible so that the test remains fair. I have chosen to change wind speed as in preliminary tests it proved to be the easiest factor to regulate and provided expected results. Diagram: ...read more.

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