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Im going to investigate the affect of light on the amount of Pleurococcus. I predict that the side with the least light will have the most Pleurococcus

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Pleurococcus Pleurococcus (a.k.a. Protococcus) is single celled green algae, it is found on the bark of trees but it never grows on softwood trees. It is the most common green algae in the world. It is found is all seasons and grows in moist places. It reproduces by cell division and is transported by the wind. As it is a green plant it photosynthesizes. The formula for photosynthesis is: 6CO2 + 6H2O --> C6H12O6 + 6O2 Carbon dioxide + Water --> Glucose + Oxygen The variables that affect Pleurococcus are: Abiotic: > Light (needed for photosynthesis) > Moisture/humidity: if it is too dry the Pleurococcus will die > Wind > Temperature > Amount of rainfall (and that trickles down the tree) Biotic > Position of tree (shading etc.) > Tree species (some trees have bark that is more suited to Pleurococcus than others) I'm going to investigate the affect of light on the amount of Pleurococcus. I predict that the side with the least light will have the most Pleurococcus. This is because if there is too much light the Pleurococcus will dry out and die, as it has no roots and the only way for it to get water is to absorb the water that runs down the tree that it grows on. ...read more.


All the measurements will be taken 1 metre up each tree. We will use the same type of quadrat (100 squares) and we will use the same type of light sensor each time. We will get the same people to do the same tasks ever time to make this a fair test. Results: Amount of Pleurococcus (%) Amount of light (%) Tree North South East West North South East West 1 7 24 35 36 83.8 89.1 85.7 87.6 2 16 0 63 0 84.5 98.4 84.8 88 3 65 3 85 8 84.8 90.8 88 87.1 4 100 20 64 100 79.8 87.1 85.2 85.2 5 38 96 25 100 92 94 91.7 94 6 100 22 30 10 88.7 87 99.5 94 7 32 9 17 12 89 91 86 90 8 33 49 27 90 84 88 82 91 9 15 9 4 0 84 92 85.7 98 10 50 23 61 44 87 93 93 88 Average 45.6 25.5 41.1 40 85.76 91.04 88.16 90.29 I found that where there is the most light (on the south side) ...read more.


As Pleurococcus is a green plant it photosynthesizes (6CO2 + 6H2O --> C6H12O6 + 6O2) and for photosynthesis water (H2O) is needed so if the Pleurococcus is in direct sunlight the water in the Pleurococcus will dry out quicker, therefore there is more Pleurococcus where there is less light. My prediction was correct, this is shown in the averages; on the north side there is least light (85.76%) and most Pleurococcus (45.6%) and on the south there is most light (91.04%) and least Pleurococcus (25.5%). Evaluation: I think that the experiment worked out pretty well because from the averages I can see a pattern. The averages were accurate enough but the separate results were not, this is because some of the trees that we tested for Pleurococcus we in a shaded area for example on trees 2,3 and 4 there is a lot of Pleurococcus on the east side because these trees were next to a fence that shaded them on the east side. To make this experiment more accurate I could have counted the amount of Pleurococcus in the individual squares in the quadrat, for example: I would have counted this as 4 out of 6 but if I had more time I would have counted it as 2.5 out of 6. Neelkumar Patel ...read more.

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