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To Investigate The Effect Of Light Intensity On The Rate Of Photosynthesis.

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To Investigate The Effect Of Light Intensity On The Rate Of Photosynthesis Introduction We were set an experiment to investigate the effect of light intensity on the rate of photosynthesis; we did this by using an angle poised lamp and shining it on a beaker with some Elodea Cana Densis (Canadian pond weed) in it, measured distances from the bulb to the beaker and counted how many bubbles floated above a marked point on the beaker. Plotted a graph from these results and drew a line of best fit. Carbon Sunlight + Water Glucose + Oxygen Dioxide Chlorophyll 6CO2 + 6H2O C6H12O6 + 6O2 Apparatus: Beaker Spatula Stopwatch Bulldog Clips Canadian Pond Weed Sodium Hydrogen Carbonate Angle Poised Lamp - 60 Watts Prediction I predict that the closer the lamp (bulb) ...read more.


To make this a fair experiment we had to mark a point on the beaker and counted every bubble that rose above that point. Method The variables we can control are the background (room) lighting, because if the surroundings were darker in some and not in others the number of oxygen bubbles that are given off may change. To speed up the rate of photosynthesis we added a spatula of Sodium Hydrogen Carbonate (Bicarbonate of Soda). Safety To make this experiment safe, we will have to tuck in chairs and make sure that coats and bags are tucked away because you may trip and fall spilling or smashing a beaker, or if you spill something on your desk you don't have to get wet just move out of the way. ...read more.


I can see this from my line graph that more bubbles rose when the bulb was closer, than when the bulb was further away. Evaluation I think that I could have done better if I got a first set of results that were correct, but instead our teacher gave us a set of more consistent results so it wouldn't mess up our graphs or conclusions. Our results weren't consistent because it was hard to tell how many bubbles rose at a time, because the bubbles were stuck to the leaf and some of them were too small to see. We also could have sped up the rate of photosynthesis by increasing the carbon dioxide, as it needs this to do the process. Scott Swanson 10DJG ...read more.

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