Biodiversity describes variety within and between ecosystems, species, and genes, with species richness, evenness, and Simpson index enabling quantitative comparison.
Coverage 2010–2024 · Updated 15 Jul 2026
Biodiversity is the variety of life, measured at genetic, species and ecosystem levels.
Genetic diversity helps populations respond to change; species diversity describes richness and relative abundance; ecosystem diversity captures different habitats and ecological processes. A place can be rich at one level and poor at another. Use the evidence scale and context before drawing a broad conclusion.
State the level before measuring:
A forest may contain many species but little genetic diversity in a bottlenecked tree population, so one metric cannot describe all biodiversity.
Species count alone is not a complete biodiversity measure.
This objective is assessed through structured response, commonly using State / Discuss / Calculate.
State / Discuss / Calculate / Analyse / Compare / Evaluate / Distinguish / Suggest
Build the answer around this relationship: Biodiversity includes ecosystem diversity, species diversity and genetic diversity.
Equating richness with overall biodiversity when evenness also affects diversity.
Representative question
Entire communities need to be conserved in order to preserve biodiversity. Suggest different quantitative methods to measure changes in biodiversity in a community over time.
A strong conservation answer follows a chain: define biodiversity, measure evidence of decline, identify human drivers, then justify conservation action. Biodiversity includes ecosystem, species, and genetic diversity; species diversity uses richness and evenness. Evidence comes from estimates, fossils, repeated surveys, IPBES reports, and indices. Drivers include extinction pressure, ecosystem conversion, population-driven resource demand, pollution, and invasive species. Responses include in situ, ex situ, and EDGE prioritization.
