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Biology coursework

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Biology Coursework- Photosynthesis Introduction: Photosynthesis is the process that is used by plants to produce energy from carbon dioxide (CO2) + water (H2O) and light energy. The word equation for this is: Light energy Carbon dioxide + water -------------------> Glucose + Oxygen This can also be put into this symbol equation: 6CO2 + 6H2O light energy C6H12O6 + 6O2 The Factors which affect the rate of photosynthesis are Carbon dioxide levels, Light Intensity, Temperature (how hot or cold if it varies),Wave length (colour or light),Amount of water and Chlorophyll The reason I chose to look at light intensity are because it is simple to measure and can be repeated without difficulty a range of times. A plant can live with lots of water and carbon dioxide, but it will not photosynthesise very quickly if there is not enough light; so increasing the light intensity will make photosynthesis faster, therefore decreasing it will slow photosynthesis down. I have carried out a previous experiment on photosynthesis by starch testing leaves to find out what necessary conditions for photosynthesis were. ...read more.


Another problem is that plants also use some of the oxygen they produce, which again is not possible to measure. But this factor might not affect the results, as it is still fairly regular and the volume of oxygen not sent out as bubbles are very little and insignificant as a result the results will be quite fair, and reliable for all the experiments. Another problem that I will have is that the CO2 concentration in the water will go down as the plant photosynthesises. However this doesn't matter much as it is outweighed by the need to have a steady and reliable size surface area To make the experiment a fair test I would have to keep the following things constant: * The water concentration * The leaf area * The carbon dioxide (CO2) concentration * The wave length * The temperature To make my results as exact as possible I would have to repeat the experiment about three times to see if the patterns are similar and keep the results to the nearest centimetre for precision. ...read more.


0 50 0 50 0 40 0 40 0 40 0 AVERAGES 100 90 80 70 60 50 10 8 6.8 4.5 2 0 Evaluation My experiment went very well, and has allowed me to prove my hypothesis that the greater the light intensity, the faster the rate of photosynthesis, until another limiting factor is there. To improve my experiment I would have to do it in a more controlled environment, as there were more than one group of people doing the experiment so the temperature in the room varied a bit from people walking in and their body heat making the temperature go up and down. So the results could have been more accurate if the whole experiment had a set temperature that didn't change. I also need to find a way around the problem, of oxygen being released/ used without any physical affect that I can record. Looking at my graphs the pattern it goes up in a straight line I believe that my results are correct. Also the line of best fit in both graphs goes through nearly every plot on my graph making my results seem almost perfect. ...read more.

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