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IB ESS HL 3.1.1 Biodiversity Levels Questions

Distinguish genetic, species and ecosystem diversity and explain why each matters.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • distinguish genetic, species and habitat diversity and relate abundance to species diversity
  • evaluate conservation importance using endemism, species richness, habitat diversity, ecological services and human threat
  • analyse how coral, mangrove and seagrass habitat diversity can create niches and influence fish diversity

IB ESS HL 3.1.1 Biodiversity Levels Questions question 1

[Maximum number: 1]
Figure 1(a): Extinction risk levels of species in global biodiversity by category

Figure:Extinction risk levels of species in global biodiversity by category

Figure 1(b): Changing species extinction risk by category 1980–2015

Figure:Changing species extinction risk by category 1980–2015

Figures 1(a) and 1(b) are based on records for species diversity. Identify one other factor that may be measured to assess the diversity of life on Earth.

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