# Homework Help: AQA Unit 4 - June 2010

Tags:
1. Dec 24, 2011

### RCB

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

http://store.aqa.org.uk/qual/gce/pdf/AQA-BIOL4-W-QP-JUN10.PDF

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
thanks!!!

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

NO CHANGE
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