My aim is to investigate the rate of photosynthesis from a plant in water Essay Example

My aim is to investigate the rate of photosynthesis from a plant in water Essay Example My aim is to investigate the rate of photosynthesis from a plant in water Essay My aim is to investigate the rate of photosynthesis from a plant in water Essay as I explained earlier in my background knowledge. On my graph of all the results, there are a few obviously different results, but none look like they were that weird. But when I put the separate plants results into separate graphs it showed that all the results were completely different, except for the third one because all the lines, although they were decreasing, they were all decreasing from different amounts of bubbles to another test of the same plant. For example, the third test on the second plant: the number of bubbles at five cms away from the light was 69 whereas the other two were 35 and 32. These weird results will uneven our average, and it isnt a very fair test of accuracy. The only plant that did have the most near results to each other was the third plant, so if we wanted a more fair result we could just average those up but then we wouldnt have much to compare to. If two out of three sets of results are dodgy then this must mean there is something wrong with the way we were doing our experiment. From our averaged graph there is an obvious pattern, the number of bubbles produced by the plant starts of at a high number usually between fifty and sixty and then decreases steadily until it gets to twenty five cms away from the light where then it still decreases but less steeply than before. EVALUATION: Our experiment didnt go to well because although we managed to keep everything under control as much as possible, and we didnt get a huge amount of freak results, it still isnt a very reliable way of testing what we wanted to find out as it is way too basic. If we wanted to use the same method but improve it we could involve more people so that we would be able to check we had counted the bubbles correctly. Also we would need to control the background light as it would interfere with the experiment, but we didnt have the means for it this time. Because of all these problems the strange results we got are very likely to be accuracy problems when counting the bubbles. It isnt a fair test to have one person counting them all because they might not count properly, but a way of solving this is to have a few people counting so that the results would be more exact. The background lighting interferes because it adds to the rate of photosynthesis when we want to be testing from a certain light intensity. We managed to keep the temperature pretty much the same for the whole experiment, it dipped between 23c and 25c, so even though we did as best as we could, if there was a way of keeping a constant level temperature it would make the test a lot more fair. An even better way of improving this experiment would be under properly controlled conditions where we wouldnt need to rely on someone having to count the bubbles, and we could use more reliable tools.