Growing Pleurococcus
Aim
The aim of this experiment is to find out which side of a tree the
most Pleurococcus grows upon, and why this is so.
Prediction
I think the most Pleurococcus will grow on the North side of the tree.
I think this will happen because, the south side of the tree receives
the most sunlight. The heat from this sunlight would dry out the
Pleurococcus, which would cause it to dry out, and die. As
Pleurococcus is an algae, it photosynthesises. This means it needs
water as is shown in the photosynthesis equation below.
Sunlight
[IMAGE]Water + Carbon Dioxide Oxygen + Glucose
(aq) (g) (g) (s)
Sunlight
[IMAGE]6H20 + 6CO2 6O2 + C6H12O6
(aq) (g) (g) (s)
If it can not photosynthesise, it will not have enough energy to grow,
reproduce, respire, and repair, it will, therefore, die. The other
input into photosynthesis, is Carbon Dioxide, because Carbon Dioxide
is a gas, and diffuses, it will not affect our experiment. The other
thing that Pleurococcus needs to photosynthesise, is sunlight. Even in
the North, there is enough sunlight for it to photosynthesise. The
sunlight in the North is not enough to dry it out, because
Pleurococcus has heavy cell walls, which prevents excessive water
loss.
[IMAGE]
Basic Pleurococcus cell
Fair test
To ensure this is a fair test, I will be measuring 10 different trees,
instead of just one. This is because, if just one tree was measured,
the results from that tree could be an 'anomaly' (abnormal result,)
which would mean that I could not draw any fair conclusions. I will
then work out an average of my results, thus ensuring that I could
analyse them properly. Since in each experiment, I will be changing
the tree, I must not change any other factors, if possible. Obviously,
as it is outside, it will not be possible to ensure that I do not
change any factors. All the trees will be in different destinations,
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and get a drink of water and then drive the car out of the garage.
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