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Homework Help: AQA Unit 4 - June 2010

  1. Dec 24, 2011 #1


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    1. The problem statement, all variables and given/known data


    Question 7eii) asks "What conclusions can you draw from the data in figure 3 about the effect of human disturbance on the animals living on the seashore. Explain

    The mark scheme (http://store.aqa.org.uk/qual/gce/pdf/AQA-BIOL4-W-MS-JUN10.PDF) gives the following marking points:

    1. Fewer larger animals/more smaller animals where more people/more disturbance;
    2. 0.09 linked to 34.6/appropriate link between row 4 and row 1;
    3. Larger animals affected by human activity;
    4. Smaller animals are young animals;
    5. Fewer species of seaweed (with disturbance);
    6. (So) fewer niches /habitats (for large animals);

    The only points I understand are 5 and 6. Please could someone explain the other marking points (maybe in prose rather than bullet points) to make it clearer to me

    2. Relevant equations

    3. The attempt at a solution

    Lets take marking point (1)

    dry biomass: abundance is the same as saying
    (dry biomass) / (abundance)

    so lets say average biomass is 5 kg, we have 1000 animals
    (5*1000)/(1000) = 5
    If no. of small animals increases to 9000
    (5*9000)/9000 = 5

    how can marking point (1) make sense
    what is the significance of (2)???
    and how are (3) and (4) concluded from figure 3 (see link)

    Its a horrid question :(

    Its a really confusing question and mark scheme
  2. jcsd
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