Investigating Pleurococcus
Plan
Pleurococcus is a green, single-celled algae that is found on the bark
of trees, where it survives better on the north side of the tree and
near the ground. It can also be found on stones and fences and usually
in moist situations. As it is a green plant, as all green plants do -
it photosynthesises.
The chemical reaction that is taking place is:
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Carbon Dioxide + Water Glucose + Oxygen
light
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Chlorophyll
[IMAGE]6CO2 + 6H2O C6H1206 + 6O2
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Variables that affect Pleurococcus:
Ø Light: is required for photosynthesis
Ø Moisture/humidity: if it is too dry, the Pleurococcus will become
too dry and die out, as they are green plants and require
humidity/moisture to survive.
Ø Wind: It can transport moisture. However, it could bring about
drying out and death of the algae.
Ø Temperature
Ø Amount of rainfall that runs down the tree. If it is too much, it
washes off the Pleurococcus
These are called Abiotic Features.
Variables that are Biotic are:
Ø Position on the tree: leaves may cause dimness and branches may
change the local humidity conditions.
Ø Animals: birds and animals may remove the Pleurococcus.
Ø Tree species: each tree has its own rind category, some more
appropriate to the Pleurococcus than others.
Ø Location: the location of the tree will largely influence abiotic
factors (e.g. shadowing effects of other trees and disclosure to the
elements)
Ø Pleurococcus contains chlorophyll and has a single-cell. It expands
rapidly in warm and damp conditions by simple binary fission (ways of
how they actually come together/ join, like Miosis and Mitosis).
I have decided to investigate the effect of light upon the growth of
Pleurococcus.
My hypothesis is that the side of the tree with the least light will
have the most Pleurococcus, as too much light will make the
Pleurococcus dry out and die, as it has no roots, and the only
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