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An investigation into the effects of Carbon Dioxide concentration on the rate of photosynthesis.

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An investigation into the effects of Carbon Dioxide concentration on the rate of photosynthesis by Daniel Lynch 11FS Plan and Method Photosynthesis is the process in which green plants produce food from sunlight. To find out how carbon dioxide affects the rate of photosynthesis I will use an underwater plant called Elodea, when I have the Elodea I will put my Elodea in a beaker with 250cm cubed of water in it. Then I will place a funnel over the Elodea and place a test tube over the top of the funnel. When this is done I will count how many bubbles are given off in thirty minutes. After these thirty minutes are up I will add 0.1 gram of Sodium Hydrogen Carbonate and count the bubbles given off in thirty minutes. Again after these thirty minutes are up I will add another 0.1 gram of Sodium Hydrogen Carbonate, I will control the amount of Carbon Dioxide in the water with Sodium Hydrogen Carbonate. ...read more.


I will keep my test a fair by keeping my experiment in the same temperature and in the same place. The Elodea that I choose is also an important factor in a fair test as the Elodea are not always the same. If my piece of Elodea were smaller than another then I would expect it to have less chlorophyll, therefore producing less oxygen. To keep my test fair I will use the same piece of Elodea each time. Water would normally be a limiting factor in the process of photosynthesis, however this will not be the case in my experiment as the beaker will be full of water. Carbon Dioxide will be the limiting factor in my experiment Prediction I predict that the more Sodium Hydrogen Carbonate added to the water, the more carbon dioxide particles there will be to collide with the plant particles; therefore I predict that more oxygen and glucose will be produced by the Elodea. ...read more.


I have circled these results on my graph and highlighted them on my table. There are quite a lot of possibilities that could of caused these anomalous results. These include variations in bubble size, not all of the bubbles were the same size. Therefore some may of gone by unnoticed. Also bigger bubbles would have more oxygen in them, the predicted result pattern was mainly relying on the bubbles all being the same size. Also some bubbles may have stayed on the Elodea and not risen to the surface. These bubbles would not of been accounted for. If I were to do the experiment again I would make improvements to achieve more conclusive results, for example I might do it the way we originally planned by collecting oxygen given off in a measuring cylinder, this is a much more accurate way of doing the experiment as I am measuring gas not bubbles and I wont have to worry about the size of bubbles. If I were to do further work on this experiment I would continue investigations by adding more carbon dioxide until my graph levelled off. ...read more.

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