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Photosyntesis in a Pond Weed.

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Introduction

Biology Coursework Photosyntesis in a Pond Weed Aim: The aim of this experiment is to find out what effects the amount of photosynthesis happening in a pond weed. Introduction: A piece of pondweed will be cut and placed into a test tube containing water and sodium hydrogen carbonate, which is placed inside a beaker containing water. A lamp will be shined on to the pondweed and the amount of bubbles released from the plant will be counted. The lamp will be adjusted to different distances from the plant to try and obtain different results. The amount of bubbles will be counted for a period of one minute. The temperature of the water would be recorded at the start and end of the minute. Photosynthesis Equation: 6CO2 + 12H2O SUNLIGHT C6H12O6 + 6H2O + 6O2 Preliminary Work: The problems that arose whilst doing the preliminary experiment was that too much sodium hydrogen carbonate was placed inside of the test tube and all the water had turned cloudy so it was impossible to count the amount of bubbles. Also the beaker was placed too far away from the light which meant that the light wasn't reaching the beaker. The preliminary experiments showed that the closer the light is to the beaker the more bubbles appear. Distance (cm) Start Temp (�C) End Temp (�C) Amount of bubbles in 1 minute 10 32 29 32 20 30 28 22 30 29 28 13 40 29 29 6 50 ...read more.

Middle

Distance (cm) Starting Temperature (�C) Ending Temperature (�C) Amount of bubbles in 1 minute 1 2 3 Average 284 287 283 284.7 2 100 28 28 28 28 29 27 27 27.7 104 102 107 104.3 1 2 3 Average 312 317 325 318 2 90 27 29 27 27.7 27 28 27 27.3 118 115 109 114 1 2 3 Average 338 329 343 336.7 2 80 28 27 28 27.7 28 27 27 27.3 137 138 142 139 1 2 3 Average 382 376 393 383.7 2 70 27 28 28 27.7 29 29 28 28.7 148 142 152 147.3 1 2 3 Average 460 452 473 461.7 2 60 28 28 30 28.7 28 29 28 28.3 110 152 163 141.7 1 2 3 Average 601 593 615 603 2 50 28 29 27 28 27 27 28 27.3 152 159 165 158.7 1 2 3 Average 762 753 787 767.3 2 40 28 28 27 27.7 28 29 27 28 158 168 152 159.3 1 2 3 Average 895 903 892 896.7 2 30 27 27 28 27.3 27 28 28 27.7 185 176 189 183.3 1 2 3 Average 920 917 933 923.3 2 20 27 28 28 27.7 26 27 27 26.7 178 192 186 185.3 1 2 3 Average 980 977 989 982 2 10 27 28 28 27.7 27 27 27 27 183 187 191 187 1 2 3 Average 1000+ 1000+ 1000+ 1000+ 2 0 28 ...read more.

Conclusion

The results showed that the amount of bubbles rose rapidly within the first 40cm and then slowly rose, but rapidly rose again in the last 30cm. The results fell quite neatly into a best fit line and are clear and easy to understand. There were a couple of anomalies in the results which may be because the bubbles were appearing to fast to count or some bubbles may have been added accidentally. I think that our group had a good method because our results showed what we were trying to find out, which was to test if distance of a light affects the amount of photosynthesis in a pondweed. To get rid of any anomalies we could have used a gas chamber to collect the bubbles and we could test to see the amount of gas produced. Also because the bubbles only had to travel a short way until they reached the top and disappeared, if we had a longer test tube then we might have been able to count the bubbles more accurately. I think that the procedure that we had used was adequate to test and that it was reasonably reliable. In my prediction I had stated that as length decreases the amount of bubbles would increase because of the fact that there would be more particles in the pondweed to collide with each other and more chance of there being an effective collision. In future experiments we could increase the range of results as well as having more intermediate values. Ricky Pitt 1180 Edenham High School 14320 ...read more.

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