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Investigating thegrowth of pleurococcus on tree trunks

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Introduction

Investigating the growth of pleurococcus on tree trunks Factors to consider/have an effect * Type of tree * Height * Light intensity * Temperature Observations Preliminary method * On your tree, use a compass to find out which side of the tree is north. * Then place your grind against the tree trunk and count how many squares have growth on them. * Write your results down in a table and repeat for east, south and west. Preliminary results Tree number Site 1 North Site 1 East Site 1 South Site 1 West Site 2 North Site 2 East Site 2 South Site 2 West 1 25 24 4 25 9 1 12 4 7 20 11 25 13 25 13 16 18 5 22 25 22 23 5 3 0 1 4 25 20 11 13 25 13 18 16 Total 87 71 76 74 60 27 53 39 Preliminary information Pleurococcus is the most common green algae and grows on the tree trunks, poles and stonewalls. It is mostly found on the north side of the trunk at the bottom. ...read more.

Middle

Sycamore 78 25 77 15 80 3 81 2 2(3) Hawthorn 72 23 75 25 77 5 79 25 3(11) Sliver birch 79 12 82 10 76 25 78 25 4(8) Lime 76 25 78 25 76 25 78 25 5(5) Crab apple 76 18 79 23 81 16 78 25 Total 103 98 57 92 Site 2 Tree Number Tree name North LI % PC South LI % PC East LI % PC West LI % PC 1 (7) Willow 77 24 78 24 78 25 77 25 2(3) Plane 81 20 80 15 80 10 82 3 3(11) Sliver birch 78 12 82 12 82 11 63 9 4(8) Almond 82 21 80 5 76 25 83 2 5(5) Ash 72 20 81 23 81 3 82 3 Total 103 69 74 42 LI = light intensity PC = pleurococcus count Conclusion From this investigation I can tell that the amount of algae was most found on the north side of the tree trunks on site 1. From my graph I can say that it clearly shows that pleurococcus grows best on the north side of the tree on both site 1 and site 2. ...read more.

Conclusion

72 X = 12.5 Chi-Square value = 12.5 + 0.05+ 1.125 + 13.34 = 27.015 ?Reject - therefore it must be due to environmental factor Evaluation The results of my investigation were of good quality but I think there were a few errors in them. They showed that the amount of pleurococcus on both site 1 and 2, north side of the tree trunk were there same. This might be just a coincidence. The investigation was done fairly and produced fairly accurate results. If I had another opportunity to do this investigation, I would test more trees so I get a wider variety of results. I would also consider testing only one type of tree to make it fairer. I could also take a large number of readings and find the average. As light intensity was only taken on one day, to make it fairer I could take the readings over a week and then use the average reading in my investigation. Also I could investigate other factors. For example I could consider the temperature and wind. I could also investigate height on tree and the distance of the tree away from buildings. ?? ?? ?? ?? Ashleigh Kunaka 10S ...read more.

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