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Photosynthesis.In this experiment that is what I am testing for, the more oxygen produced the larger the amount of oxygen that is produced.

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Biology Coursework: Photosynthesis Photosynthesis is the process of converting Carbon Dioxide and Water into Glucose. The by-product of this is oxygen. In this experiment that is what I am testing for, the more oxygen produced the larger the amount of oxygen that is produced. CO2 + Water Light Glucose + Oxygen Above is the formula for photosynthesis. The Chlorophylls and Carotenoids absorb light energy in the leaves. This energy is then used to convert Carbon Dioxide to a set of Carbohydrates (Glucose). This then provides immediate energy for the plant and any unused sugars are converted into starch and stored in the leaves for use at night or during a day where there is no light. This reaction takes place in the cytoplasm, at a certain point the cytoplasm will stop providing the chemical reaction needed to change the light, water and carbon dioxide into oxygen and glucose. This is basically because the cytoplasm can't handle anymore. Planning In this experiment there are a number of different factors to go through. These will all affect the rate of Photosynthesis in a number of different ways. These variables are: * Light Intensity * Temperature * Amount of Sodium Bicarbonate in the water All these will affect the experiment differently. ...read more.


Diagram Results Distance Size of Air Bubbles 1 2 3 Average Control 3 mm 4 mm 6 mm 4.33 mm 60 cm 25 mm 23 mm 33 mm 27 mm 40 cm 80 mm 71 mm 41 mm 75.5 mm 20 cm 100 mm 102 mm 93 mm 98.33 mm Next To 140 mm 147 mm 130 mm 139 mm Analysis The results I have show a steady rise between each 20 cm rise. This is what I predicted would happen in my prediction. As I predicted the closer the light to the plant the more energy would be converted to make photosynthesis. This resulted in more oxygen being made as a by-product of the photosynthesis. As I predicted the closer to the plant the more light is converted by the chlorophylls and Carotenoids. This means that there is a lot more light energy being converted into Carbon Dioxide and in turn more energy for photosynthesis. More photosynthesis means a lot more waste products, one of these is Oxygen. The more oxygen there is the bigger the air bubbles and the therefore we could measure them. As the graph shows there is a steady rise in the amount of oxygen bubbles produced as we increased the light intensity. ...read more.


There could have been other explanations as well such as the amount of Sodium Bicarbonate could have been wrong or the test tube may not have been secured with a bung. All these could have been part of the problem with the experiment. I didn't use this result in the graph or analysis. I have highlighted it and it will stay out of the final results. If I were to improve this experiment I would use a dark room and then I would have measured the result using more scientific equipment. This would have been more scientific and less amateur. This would have most probably cut down on the mistakes. If I were to do the experiment again I would have a smaller more designated area of results. This would be in the higher bracket of the table. This would be between the 20 cm away from the test and next to the test. This would give us an n idea of the highest point that this plant can absorb light intensity from. It would be a simple task of narrowing down the different lengths away from the test. This would give us a clearer perspective of how high the light intensity must be before it becomes in affective in the plant. To show this I have marked this area on the graph that I have drawn. David Lay 11c ...read more.

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