Investigating the Growth of Pleurococcus on Tree Trunks

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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. To grow it needs a lot of, moisture and shade

although it still needs sunlight and water like most trees and plants.

However green algae do not have any roots. They do not have any leaves

or stomata therefore it does not have any water saving protection.

They are single celled and have to grow in clumps to avoid

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