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IB Biology HL A4.2.1 Biodiversity Definition Questions

Distinguish species richness from evenness, calculate Simpson diversity from species counts, and interpret biodiversity differences between communities.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Distinguish species richness as the number of species from species evenness as the similarity of their population sizes.
  • Calculate Simpson’s reciprocal diversity index from species counts and show the numerator, denominator and final value.
  • Interpret a higher Simpson index as greater community biodiversity and compare richness, evenness or stability between sites or sampling times.

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Study A4.2.1—Biodiversity definition conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A4.2.1 Biodiversity Definition Questions question 1

[Maximum number: 1]

State one use of the Simpson index in ecology.

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