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AQA GCSE · Question 04.5 · Ecology
Scientists counted the numbers of five different animals in the river at sites A and B. Table 2 shows the results. Complete Figure 7. You should use data from Table 2 for the sludge worm and the bloodworm.
Scientists counted the numbers of five different animals in the river at sites A and B. Table 2 shows the results. Complete Figure 7. You should use data from Table 2 for the sludge worm and the bloodworm.
How to approach this question
1. Look at Table 2 to find the data for the sludge worm. At Site A, there are 80. At Site B, there are 2.
2. Look at the key for Figure 7. Site A is the white bar, and Site B is the grey bar.
3. For the "Sludge worm" category on the x-axis, draw a white bar up to the 80 mark on the y-axis. Draw a grey bar next to it up to the 2 mark.
4. Repeat for the bloodworm. From Table 2, Site A has 36 and Site B has 8.
5. For the "Bloodworm" category, draw a white bar up to 36 and a grey bar up to 8.
Full Answer
For Sludge worm: Bar for Site A should be at 80, bar for Site B should be at 2.
For Bloodworm: Bar for Site A should be at 36, bar for Site B should be at 8.
The task is to plot the data from Table 2 onto the bar chart in Figure 7 for two animals.
- **Sludge worm:** Table 2 shows 80 animals at Site A and 2 at Site B. On the chart, under "Sludge worm", the bar for Site A (white) should be drawn to a height of 80. The bar for Site B (grey) should be drawn to a height of 2.
- **Bloodworm:** Table 2 shows 36 animals at Site A and 8 at Site B. On the chart, under "Bloodworm", the bar for Site A (white) should be drawn to a height of 36. The bar for Site B (grey) should be drawn to a height of 8.
Common mistakes
✗ Reading the wrong values from the table.
✗ Confusing the bars for Site A and Site B (plotting the colours incorrectly).
✗ Inaccurately drawing the bars to the wrong height on the y-axis scale.
Practice the full AQA GCSE Biology Foundation Tier Paper 2
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