How to Revise Classification and Biodiversity — Pearson A-Level Biology
Define biodiversity. Explain how biodiversity is measured
Examiner Tips for Classification and Biodiversity
- Use examples of different ecosystems to illustrate biodiversity.
- Practice calculating a diversity index from sample data.
- Link measurement methods to conservation efforts.
- Use specific examples like peppered moths or antibiotic resistance.
- Link evidence types to specific conclusions.
- Avoid teleological language (e.g., 'in order to').
- In written responses, always present binomial names in the correct format, and if handwriting, underline them clearly.
- When describing principles, link classification to evolutionary relationships (phylogeny) to show deeper understanding.
Common Mistakes in Classification and Biodiversity
- Confusing biodiversity with just the number of species.
- Omitting genetic or ecosystem diversity in definitions.
- Failing to explain how indices like Shannon-Wiener are used.
- Confusing natural selection with evolution itself.
- Thinking individuals evolve rather than populations.
- Ignoring the role of genetic drift.
Key Marking Points
- Define biodiversity clearly, including its three main components.
- Explain how species richness and evenness contribute to biodiversity measurement.
- Describe at least one method for measuring biodiversity, e.g., quadrat sampling.
- Interpret a simple diversity index calculation.
- Explain the four steps of natural selection: variation, inheritance, selection, time.
- Describe how adaptations arise through natural selection.