How to Revise Biodiversity — OCR A-Level Biology
Biodiversity is a topic in the OCR A-Level Biology specification. This guide covers learning objectives, examiner tips, common mistakes, and key terminology to help you revise effectively.
Examiner Tips for Biodiversity
- Ensure you can interpret high and low values of Simpson's Index of Diversity (D) in terms of habitat stability
- Be prepared to calculate the proportion of polymorphic gene loci using the provided formula
- Know specific examples for in situ and ex situ conservation methods
- Understand the difference between random and non-random sampling techniques and when each is appropriate
Common Mistakes in Biodiversity
- Confusing species richness with species evenness
- Misinterpreting the value of Simpson's Index of Diversity
- Failing to distinguish between in situ and ex situ conservation methods
- Incorrectly identifying the factors that contribute to genetic biodiversity
Key Marking Points
- Distinction between habitat, species, and genetic biodiversity
- Understanding of species richness and species evenness
- Application of sampling techniques (random vs non-random)
- Interpretation of Simpson’s Index of Diversity (D) values
- Calculation of genetic diversity using polymorphic gene loci
- Identification of factors affecting biodiversity (e.g., human growth, agriculture, climate change)