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Investigation into the effect of light intensity on the rate of photosynthesis.

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Investigation into the effect of light intensity on the rate of photosynthesis. Prediction I predict that the amount of oxygen produced will increase as the light intensity increases. "Sometimes light is a limiting factor. A plant may have lots of water and carbon dioxide, but it will not photosynthesise very fast if there is not enough light; increasing the light intensity will make photosynthesis faster." Concluding from this statement, light is one of the requirements of photosynthesis, so moving the light source closer and further away from the plant will give it varying degrees of light intensity. As the light is moved closer to the plant photosynthesis will speed up and eventually come to its highest point and level out. As the amount of carbon dioxide and the temperature also affect the plants rate of photosynthesis, the plant may have plenty of light but "cannot photosynthesise because it has run out of carbon dioxide or it is to cold for the enzymes to work properly." That's why it may level off. ...read more.


* Safety. I will make sure that the tank of water is not near any electrical appliances. I will also make sure the area around the experiment is clear and that there is nothing dangerous on the floor. * I will record my results in the following table: Test Distance of lamp away from beaker Volume of oxygen (mm) 1 2 3 1 2 3 1 2 3 1 2 Etc. Once I have collected all my results I will plot them on this graph to get the rate of photosynthesis, and how it differs when the lamp is moved. I am going to put all the results on one graph so it is easier to compare them and write up an evaluation. Amount of Oxygen Produced (MM) Distance of lamp away from beaker Results I was unable to conduct the experiment in the laboratory because there was not enough oxygen produced to make the results reliable Test Light intensity (%) ...read more.


Conclusion As the light intensity is increased the rate of photosynthesis also increase, so my prediction at the beginning of the experiment is correct. I also predicted that the rate of photosynthesis would come to its highest point and then level out. This is because the plant has plenty of light but it will eventually run out of carbon dioxide to photosynthesise any more. This theory also includes temperature and light, along with carbon dioxide they are the "limiting factors" of Photosynthesis. My graph did not level out because it always had plenty of carbon dioxide. Evaluation To evaluate my experiment I would say that it went well, but would have liked to carry out the experiment instead of using the computers. In my results table I found I needed to add an extra column entitled "rate of photosynthesis" so I was able to use that information later in my graphs. I also found it easier to use two graphs instead of one, as I used ICT to make my graphs. ...read more.

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