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The transpiration rate of a plant cutting is affected by the wind speed of the air in the atmosphere surrounding it.

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PLAN HYPOTHESIS: The transpiration rate of a plant cutting is affected by the wind speed of the air in the atmosphere surrounding it. I think that the transpiration rate of a plant will increase if the wind speed increases. In the absence of any air movement the water vapour which diffuses from the stomata accumulates near the leaf surface. This reduces the water potential gradient between the moist atmosphere in the stomata and the drier air outside. The transpiration rate is thus reduced. Any movement of air tends to disperse the humid layer at the lead surface, thus increasing the transpiration rate. The faster the wind speed, the more rapidly the moist air is removed and the greater the rate of transpiration. METHOD: In order to investigate that wind speed affects the transpiration rate of a plant I will measure the transpiration rate of a plant shoot cutting using a photometer and a fan where I will regulate different wind speed and then measure the transpiration rate at different wind speeds. ...read more.


The tap should then be turned to close off the syringe. * Measure the distance moved by the air bubble in the calibrated capillary tube in a given time. Re[eat the procedure three times, using the syringe to return the air bubble to zero each time. This experiment will be done three times in five different wind speeds. Once with no wind, and then gradually the wind speed will increase each time using the different wind speed settings on the fan. CONTROLLED VARIABLES: There are many controlled variables which have to be the same throughout the whole investigation: * The temperature: A change in temperature affects both the kinetic movement of water molecules and the relative humidity of air. A rise in temperature increases the kinetic energy of water molecules and so increases the rate of evaporation of water. At the same time it lowers the relative humidity of the air. ...read more.


* The Plant: The plant cutting must be the same one throughout the whole experiment. A different plant cutting could alter the results and change the transpiration rate due to the no. of xylems they have, also the length and diameter of plant may differ, and therefore the force by capillary action could differ affecting the transpiration rate of the water. APPARATUS LIST: * Knife to cut leaf shoot * Potometer * Fan * Beaker * Stop Clock * Thermometer * Water * Plant RISK ASSESEMENT: When carrying out this investigation there must be many precautions one must take into account to ensure complete safety. One must be careful as one is using a lot of glass ware which can easily break and become potentially dangerous. Also when using the knife to cut a shoot off a plant one must be careful not to cut oneself. One must act in a calm orderly manner in the laboratory as there is a lot of equipment and toxic materials which can be very dangerous if one acts carelessly. ...read more.

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