CourseCourseConceptConceptDocumentDocument

IB ESS HL 2.1.9 Population Interactions Questions

Practise IB ESS HL 2.1.9 by identifying species relationships, tracing food-web consequences and explaining how competition, predation and mutualism regulate populations.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • identify interaction types from named species pairs, food webs and life-cycle diagrams
  • contrast predation, competition, mutualism and parasitism by their effects on each population
  • trace predator–prey feedback, lagged cycles and density-dependent population regulation
  • explain how resource overlap, seasonal access and habitat use shape competition or predation
  • analyse trophic cascades from herbivore or carnivore changes and link them to stability or biodiversity

IB ESS HL 2.1.9 Population Interactions Questions question 1

[Maximum number: 1]
The Eurasian wolf food web

Figure:The Eurasian wolf food web

With reference to Figure 6(b), state the ecological relationship between the Eurasian wolf (Canis lupus lupus) and the Eurasian lynx (Lynx lynx).

All question bank results loaded