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Transpiration in plants

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Transpiration in plants Introduction My task is to investigate transpiration in plants and how different conditions affect transpiration. Transpiration is the way water evaporates from the stomata mainly on the bottom of the leaves. Scientific knowledge Transpiration Plants take in water so that they can use some of it for photosynthesise, however most of the water taken in is lost through the stomata at the bottom of the leaf, this is transpiration. * Water enters plants through the roots. The roots are covered in millions of tiny root hair cells. * The root hair cells have a large surface area so that the plant can absorb enough water from the soil. Water is absorbed into the roots by osmosis. * Water travels from the roots, up the plant, to the leaves. * The water is carried in tubes called xylem vessels. Xylem vessels have very narrow diameters - they are microscopic capillary tubes. This helps water to travel up the plant by capillarity (capillary action). This is an example of transpiration at work. Stomata On the underside of the leaves are tiny holes called stomata (singular: stoma), which allow the plant to breathe. When the water reaches the leaves it evaporates and escapes through the stomata. This is called transpiration. As the water escapes, more water is sucked up the xylem. ...read more.


A black bag, for our 3rd experiment to cover it up. Rubber tubing, so that the stem is sealed tightly. A piece of filter paper Stopwatch A stand Method First of all we fill the glass tube with water, the rubber tubing is place on the end of the pipette, there can't be any air bubbles in the tube. We then push the plant into the rubber tubing, again making sure there aren't any air bubbles. We then clamp the plant horizontally with the end of the tube in the beaker of water, leave it for 10 minutes so that the plant has time to adjust to it's new conditions then start the experiment. So we take the end of the tube out of the beaker and make an air bubble by putting the piece of filter paper underneath the end of the pipit, this creates an air bubble. We mark the top of the air bubble and then start the timer. At minute intervals we measure how far it's gone up from the marked point. We do this for 10 minutes For our second experiment we change the conditions of the plant, we place it next to a window so that the sun is shining directly on it to see if this will speed up the reaction With the third, a black bag is placed over it, to see if the reaction will slow down. ...read more.


3 is in the right sort of place but 2 if 1 was done properly should be higher than 1. Evaluation of my experiment There were a few things wrong about my experiment however it still managed to prove my point of how different conditions affect transpiration, however experiment 2 still had strange results so I have thought up of a few reasons why experiment 2 had abnormal results. * The plant was placed next to window; this might have somehow affected the plant's transpiration rate. * The sunlight may not have been that bright on the particularly day. Experiment 3 was also unable to evaporate any of its water from the top of the leaves since we found water droplets all over the leaves when we took the bag off. How could I improve my experiment? If I ever did this experiment again here are the ways in which I would improve my experiment * I would use the same plant for every experiment. * That the room temperature was about the same. * Do the experiments at the same. * For experiment 3, use a bag that would stay the same temperature as the classroom, the plant was unable to let water evaporate from its top leaves. * For experiment 2 make sure the sun was quite bright. All in all my experiment was generally a success obviously the experiments going wrong couldn't be helped but could have been easily done again and improved. 1 ...read more.

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