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IB ESS HL 2.1.6 Distribution Factors Question Bank

Explain how abiotic and biotic factors determine where a species can live.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • define or identify the ecological term precisely
  • connect the evidence to species, habitat or niche relationships
  • justify the conclusion using abiotic and biotic factors

2.1.6—Distribution factors 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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