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investigate the effect of carbon dioxide concentration on the rate of photosynthesis.

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Introduction

17/07/2004 Bilawal Ajmal Khan 10A H/W/K Science Investigation Aim: to investigate the effect of carbon dioxide concentration on the rate of photosynthesis. Scientific knowledge: The Elodea (Canadian pondweed) makes bubbles of oxygen when it photosynthesises. The faster it photosynthesises the faster it makes oxygen. The plant uses dissolved carbon dioxide. This can be made by adding hydrogen carbonate solution to the water. The factors which can effect how quickly a plant can make food by photosynthesis include the following. * Carbon dioxide concentration - this can be simulated by changing the volume of hydrogen carbonate solution added to the water. At low concentrations of carbon dioxide the rate of photosynthesis is very slow. As you increase the concentration of carbon dioxide the plant can make food faster and faster. There is a limit however. There comes a time when adding more carbon dioxide does not increase the rate of photosynthesis. The plant is making food as fast as it can under the conditions. * Light intensity - this can be altered by either changing the brightness of the bulb or by moving the bulb further and further away from the plant. ...read more.

Middle

beaker * Put Elodea plant inside water * Cover plant with inverted funnel and test tube and stick with blu tac as shown above in diagram * Count the number of bubbles collected in the test tube for each volume of hydrogen carbonate after 5 minutes * Repeat experiment by adding Hydrogen Carbonate in volumes of 5, 10, 15 and 20 cm� in three different beakers * Repeat experiment 3 times for each volume of hydrogen carbonate. Safety rules: * I will wear goggles throughout the experiment * Do not make contact with hydrogen carbonate and if this happens wash off with plenty of water immediately * Normal laboratory rules must be followed at all times Variables: The variables in this experiment are volume of water, the plant and the hydrogen carbonate powder. Fair Test: I will keep the volume of water and the plants same throughout the experiment. I will change the volume of hydrogen carbonate. The experiment will be repeated 3 times in different beakers for fair and reliable results. ...read more.

Conclusion

The results were also reliable because for each volume of hydrogen carbonate added, three different results were obtained and the average found. This was meant to reduce the level of errors. When the amount of hydrogen carbonate added was 10cm�, the amount of oxygen bubbles produced were 13.3. This is an anomalous result because it did not fit into the curve of best fit. This anomalous result could be due to inaccurate readings and measurements. If I was asked to carry out this experiment again, I would rinse my equipment thoroughly before re-using them and have my readings confirmed by someone else before recording them. I think that I have enough evidence to firmly support my evidence because I took several readings and then the graph I obtained is similar to those found in several science text books. To provide further evidence to support my conclusion I could set up a control test with no hydrogen carbonate added. The results obtained will be compared with the results obtained for the experiment in which hydrogen carbonate is added. I could also redo the whole experiment to see and compare the results I obtained if they are similar. ...read more.

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A good account showing a clear understanding of concepts. A few minor errors.

Marked by teacher Adam Roberts 05/07/2013

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