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The ability to draw, read, and interpret graphs is tested extensively across all three Edexcel A-Level Biology papers. This lesson covers graph construction, interpretation, rate calculations from tangents, lines of best fit, and statistical analysis of data.
| Graph Type | When to Use | Example |
|---|---|---|
| Line graph | Continuous independent variable (e.g. time, temperature, concentration) | Rate of reaction vs temperature |
| Bar chart | Categorial (discontinuous) independent variable (e.g. species, treatment groups) | Mean height of plants in different soil types |
| Histogram | Continuous data grouped into classes | Distribution of leaf lengths |
| Scatter graph | Investigating correlation between two continuous variables | Height vs mass |
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