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EFFECT OF Light wave Length on Photosynthisis

Extracts from this document...

Introduction

´╗┐Introduction Plants are vital for the life of humans, animals and the ecosystem. They add beauty to the places that we live in and play a major role in the air purification process. Many of the medications we use to cure the diseases are made from plants. Plants and plant communities also provide the necessary habitat for wildlife and fish populations, which is very important to humans as particular wildlife and fish make up a significant portion of our diet. Most of all, the oxygen in the air we breathe comes from the photosynthesis of plants, and as a result, the quality of the air can be greatly influenced by plants. (Environment Explorers, 2008). Photosynthesis is one of nature's greatest miracles. Through this process, green plants absorb sunlight in their leaves and convert the photonic energy into chemical energy that is stored as sugars in the plants' biomass. Photosynthesis is the source of the oxygen, which we breathe. Before plants appeared, the earth's atmosphere was high in carbon dioxide but contained no oxygen. The present atmosphere, by comparison, is about 0.035% carbon dioxide and 21% oxygen - thanks to photosynthesis (Calvin M., 1962). Each year, 105 billion ton of biomass is produced by photosynthesis energy conversion (Quantum-mechanical) Optimization of Light-Harvesting in Photosynthesis, a biomass that is equal to two great pyramids of Giza is produced every single hour. If we can learn from nature and develop an artificial version of photosynthesis we would have an energy source that is absolutely clean and virtually inexhaustible. Photosynthesis requires sunlight, carbon dioxide and chlorophyll, the reaction that occurs through the combination of these ingredients causes the release of oxygen as a gas and glucose, which is the form of sugar that plants need. Chemically, cellular respiration is the exact opposite of photosynthesis. While photosynthesis occurs only in some cells, respiration occurs in all cells. (Jolliffe and Tregunna,2007) ...read more.

Middle

8.073 19.3302 27 29.0354 16.1372 19.3302 27.5 30.4052 12.1034 19.361 28 0 20.1824 19.3917 28.5 0 12.1094 19.5764 29 0 12.103 19.6072 29.5 0 12.1094 19.638 30 0 24.2188 19.638 30.5 0 12.103 19.638 31 0 12.103 19.6688 31.5 0 12.1032 19.6688 32 0 12.1094 19.6688 32.5 0 12.1094 19.638 33 0 12.1026 19.6996 33.5 0 12.1032 19.6996 34 0 12.1094 19.6996 34.5 0 12.104 19.6996 35 0 8.0682 19.6996 35.5 0 12.1094 19.6996 36 0 20.1824 19.6996 36.5 0 8.073 19.6688 37 0 12.1094 19.6688 37.5 0 16.1368 19.6996 38 0 8.0688 19.6996 38.5 0 24.2188 19.6996 39 0 16.146 19.6996 39.5 0.709 16.1372 19.6996 40 40.9595 12.1094 19.5764 40.5 38.9288 12.1094 19.4841 41 21.0686 12.1094 19.4841 41.5 22.9071 12.1094 19.5149 42 32.5882 12.1094 19.5149 42.5 32.2477 12.1026 19.5149 43 30.7737 12.1094 19.4841 43.5 42.0811 12.1034 19.4841 44 40.591 20.1824 19.4533 44.5 32.3639 12.1028 19.4225 45 23.8924 12.103 19.4225 45.5 42.9943 12.1094 19.3917 46 32.7404 12.1094 19.4841 46.5 29.0274 16.146 19.5149 The observation were similar to the previous part of the experiments, o2 concentration was almost stable around 19% while co2 concentration readings showed considerable fluctuation. The light intensity reached higher levels compared to reading of the blue light experiments, besides readings half an hour before lights on did not read zero Day Light Table 3 Table and diagram (3) showing the readings over 48 hours of the effect of a change in the intensity of day light (florescent) on the co2 and o2 concentration on photosynthesis Time (h) Light Intensity (lux) Co2 Concentration (%) O2 Concentration (%) 0 118.5488 0.092 19.9458 0.5 65.1564 0.1194 19.9766 1 75.202 0.1356 20.0074 1.5 66.8707 0.1465 20.0074 2 121.1363 0.1552 20.0074 2.5 83.6094 0.1621 20.0074 3 68.9054 0.1713 20.0689 3.5 60.2016 0.1764 20.0381 4 56.5166 0.1831 20.0074 4.5 88.2837 0.188 20.0074 5 0 0.1957 20.0689 5.5 0 0.2002 20.0074 6 0 0.2052 19.9766 6.5 0 0.209 19.915 7 0 0.2118 19.915 7.5 0 0.2146 19.915 8 0 0.216 19.915 8.5 0 0.2192 19.915 9 0 0.2198 ...read more.

Conclusion

Readings of light intensity at 0600:-07:00 am were zero for the two days, besides, at 18:00-19:00 ,when the light supposed to be off and the sun has gone down, light intensity was recorded to be around 30 lux . The graphs we obtained from the results did not match the expected for light intensity , which should be similar to the following graph As light intensity increases, the photosynthetic rate increases until a point is reached where the rate begins to plateau due to factors not related to the intensity of light. One reason might be that some of the enzymes of photosynthesis are working at their maximum rate and they are fully saturated. While photosynthesis occurs the O2 % should rise by same amount. The curves for co2 and o2 will be in synchrony with the light intensity till it reaches a plateau level where plants does not need more light so the production of both gases stabilise. Conclusion Due to difficulties with data collection,and uncertainty of the sensitivity of the sensors used in the experiments, logical conclusion could not be drawn from the data. In conclusion, the hypothesis suggested for this experiment was failed to be proved due to the mentioned errors. This is evident from the non-reasonable results appearing in the graphs and tables. Improvements There were many things that could have been improved throughout this investigation that could possibly have given better results: 1-Performing the experiments inside a light proof environment to exclude the influence of daylight. 2- A longer testing time could have given it more chance to obtain more readings and reduce the percentage of erratic readings. 3-Conducting the four parts of the experiment on the same 48 hours to eliminate the influence of change in environmental temperature and the influence of lighting [clouds] over the ten-day period. 4- Using more sensitive sensors to avoid the unexplained fluctuation in the readings. 5- using light source of lower intensity, [bellow the optimum light intensity needed for photosynthesis to examine how would that influence the O2 and Co2 concentration. ...read more.

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