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IB ESS HL 2.1.6 Distribution Factors Questions

Analyse IB ESS HL 2.1.6 by separating biotic and abiotic influences and evaluating their effects on distribution, population size and density.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • separate biotic from abiotic factors and provide examples
  • explain effects of named biotic or abiotic factors on distribution, population size or density
  • use ecosystem survey evidence to relate environmental factors to population differences

Learn this topic

Study 2.1.6—Distribution factors conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB ESS HL 2.1.6 Distribution Factors Questions question 1

[Maximum number: 2]
River discharge by month in the Danube River delta

FigureA:Number of fish species breeding by month

River discharge by month in the Danube River delta

FigureB:River discharge by month in the Danube River delta

Using Figures A and B: Number of fish species breeding by month and River discharge by month in the Danube River delta, outline the relationship between the number of fish species breeding and river discharge.

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