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An Investigation Into How Light Intensity Affects The Rate Of Photosynthesis

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An Investigation Into How Light Intensity Affects The Rate Of Photosynthesis Introduction I am aiming to research my theory the when light intensity increases on a plant, photosynthesis will also increase at a directly proportional rate, in contrast to the light. Photosynthesis is the operation in which a plant collects sunlight (or any other light) and traps it in chlorophyll, and is used in the manufacture of a carbohydrate from carbon dioxide and water. This process can be summarized by the equation below: CO2 + H2O -> (light energy) -> CH2O + O2 Or Carbon Dioxide + Water -> (light energy) -> Carbohydrate + Oxygen Light is a source of energy. During photosynthesis, the light photochemically splits water. This provides hydrogen atoms for the reduction of carbon dioxide (CO2). # Prediction I predict that the more light intensity that a plant endures, the more photosynthesis will occur. I think this because photosynthesis can increase, and the more light that falls on the plant the more photosynthesis will occur. ...read more.


Results I have collected a set of results shown below: Voltage Experiment 1 (bubbles) Experiment 2 (bubbles) Experiment 3 (bubbles) Average (bubbles) 12 52 56 60 56 9 41 42 61 (anomalous) 42 7.5 32 312 32 31 6 20 28 27 25 4.5 14 13 14 14 3 5 8 7 7 From these results I can come up with a good conclusion. Conclusion By analyzing me results I can say that my prediction is correct. The results indeed show that the amount of light intensity and oxygen go up in a directly proportional rate. I can tell this because as I increase the voltage (light intensity), the amount of bubbles increased also (oxygen). They are not all completely accurate but are accurate enough to make a firm conclusion, and say that my prediction is correct. Indeed photosynthesis proved to produce more oxygen as light intensity increased, proving the equation below: CO2 + H2O -> (light energy) ...read more.


I could use even more accurate measuring cylinders and beakers to obtain even more accurately taken readings. I could make sure I have enough water for the experiment because if I were to use another batch it may be infected or not as concentrated as the one I was previously using. There was one particular result that was obvious to me of being anomalous (I have pointed this out in the table of results). Counting wrongly, or simply adding too much water may have caused it. Most likely it was because I added too much water. I found out what I wanted to know, because my results have shown me. With this information in hand, it gives be a much clearer insight on how a plant works and its method in photosynthesising. To find out more on this subject I could carry out another experiment, such as trying to find out about the same type of thing only with other plants. I could see if they use the same to photosynthesize in different situations. Also finding out the speed of which it photosynthesize. ...read more.

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