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The rate of photosynthesis will increase as the light intensity increases.

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Photosynthesis AT1 Prediction The rate of photosynthesis will increase as the light intensity increases. Method Make the room dark as possible so light from windows do not influences the results Cut a piece of weed 10cm long Attach it to a paper clip at the uncut end so the weed is weighed down. Put into a beaker of water which so at a higher level than the weed. As shown in diagram Illuminate weed with a lamp from a distance of 1.60 meters and also place a heat shield between the lamp and baker. Count the number of bubbles given off during a period of 1min record results , and restart the experiment with the a different piece of weed 3 time . Carry put the same experiment at different length as stated below: 1.40m, 1.20m, 1.00m, 0.80m, 0.60m, 0.40m, 0.20m Results: Distance from weed in meters Attempt 1 Attempt 2 Attempt 3 Average 1.60 22 26 24 24 1.40 40 39 38 39 1.20 56 50 50 52 1.00 64 62 60 62 0.80 85 83 84 84 0.60 82 83 84 83 0.40 51 81 84 72 0.20 83 81 85 83 Conclusion I have found that as the lamp was brought closer to the pond weed the bubbles were being produced more often, and the amount of bubble produced increased. ...read more.


The best example of light energy is when it is transferred into electrical energy in solar cells. Plants have been using light energy for the photosynthesis. The products need in photosynthesis is: Carbon Dioxide and Water. The word equation for the reaction is: Carbon Dioxide + Water --> Glucose + Oxygen In plant glucose is need as food and oxygen is simple a product that isn't needed and the plant release the oxygen into the atmosphere by diffusion , this is why the bubble are produce and this is also the very reason why counting the number of bubble tell us how fast the reaction is taking place. Because light energy is needed the more light intensity the grater the rate of reaction and the faster the bubbles are produced. Until the other variables we are changing will have no other effect because of these limiting factors. These limiting factors could be: Temperature Level of CO2 And of course the light intensity; If u look at the sketch of graph of altering these variables you will see that at first there is a steady increase in the rate of photosynthesis but then the rate decreases and stabilizes, the reason why it stables is because of the other limiting factors. ...read more.


Here is a diagram of how I would setup the experiment: by doing the experiment this was I would be able to get more accurate results, and also prove if there was any doubt that the bubble are oxygen bubbles, using the collected, gas in the syringe, and putting a glowing splint into it, obviously if it the splint re lit its self I would know that the gas a oxygen. If I was to extent this investigation I would try to see how other variable can affect the rate of the bubbles being produces: For example, if I wanted the see how carbon dioxide concentration affected the rate of photosynthesis then I would use different concentration of carbonated water and look for any changes. Also another variable I could investigate would be the temperature of the water in which I place the pond weed and chance the temperatures to find an optimum temperature; I and I would predict for such a experiment that above a certain temperature photosynthesis would stop because the plant cells would die. Sources for information and Application used : CGP revision guides ( chemistry & Biology) Lansdale Science Revision Guide ( Vol 1,2) MS WORD MS EXCELL MS PAINT ...read more.

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