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IB Biology SL A4.2.1 Biodiversity measures Question Bank

Practise IB Biology SL A4.2.1 by distinguishing richness and evenness, calculating Simpson diversity and interpreting ecosystem data.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Distinguish species richness from evenness when comparing community biodiversity.
  • Calculate and interpret Simpson reciprocal diversity to compare ecosystems or field sites.

A4.2.1—Biodiversity definition question 1

[Maximum number: 1]

The tundra ecosystem in Finnish Lapland has a short growing season and a mean temperature of −2.0∘C-2.0^{\circ} \mathrm{C}. It is also naturally grazed by herbivores such as reindeer (Rangifer tarandus). Different quadrats were set up to include and exclude the reindeer in both normal and warmed temperatures. Open-topped warming chambers were used to heat both the soil and air in the warmed quadrats. The graph shows the changes in plant richness over five years.

Figure for Question A4.2.1—Biodiversity definition question 1 — IB Biology SL

State what is meant by species richness.

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