• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

Extracts from this document...


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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Investigating thegrowth of pleurococcus on tree trunks

    * Using the metre rule, we are going to measure a metre up the tree trunk from the bottom. * We are then going to use the quadrant to count how much pleurococcus is on the tree trunk.

  2. Investigating the abiotic factors that affect the size of Ivy leaves in shaded and ...

    Whirling Hygrometer - used to measure the humidity in region. 9. Anometer - used to measure wind speed. 10. Trowel - used to dig up the soil sample from the two different areas. 11. 3 x Small plastic bags - carrying the soil sample.

  1. Investigating Pleurococcus

    in the west, exposing the south side to the most light, leaving the north side with the least light. Therefore, the least amount of Pleurococcus will grow on the south side, as it is exposed to the most sunlight. Method Apparatus > Quadrat (10 x 10 squares; altogether 100 squares)

  2. Investigating the distribution of Pleurococcus on trees.

    This indicates that in the trade-off between sunlight and water for photosynthesis, water takes precedence. On the South side it would be too dry for algae to grow in large quantities proving that water is the most important factor in photosynthesis.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work