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IB ESS SL 2.1.9 Population Interactions Questions

Practise IB ESS SL 2.1.9 questions that classify species interactions, compare their effects and explain how predation, competition and mutualism change populations.

Syllabus
First assessment 2026
Course
ESS SL
Level
SL

Exam points

  • classify herbivory, predation, parasitism, mutualism, disease and competition from species pairs or food webs
  • compare interactions by identifying which populations benefit, are harmed or compete for resources
  • explain predator–prey feedback, including delayed cycles and population regulation
  • explain how competition, seasonal access or habitat overlap changes interaction outcomes
  • connect herbivore and carnivore interactions to trophic effects, biodiversity and ecosystem stability

Learn this topic

Study 2.1.9—Population interactions conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB ESS SL 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: The Eurasian wolf food web, state the ecological relationship between the Eurasian wolf (Canis lupus lupus) and the Eurasian Iynx (Lynx Iynx).

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