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IB ESS SL 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 SL
Level
SL

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: 1]
Figure: Four species of the family Leporidae

Figure:Four species of the family Leporidae

Figure: A dichotomous key for species A to D

Figure:A dichotomous key for species A to D

Figure: Sagebrush ecosystem without invasive cheatgrass

Figure:Sagebrush ecosystem without invasive cheatgrass

Figure: Sagebrush ecosystem with invasive cheatgrass

Figure:Sagebrush ecosystem with invasive cheatgrass

The family Leporidae includes hares and rabbits. The figures show four species that can be found in western North America.

The sagebrush ecosystem provides a habitat for pygmy rabbits. Suggest one reason why there might be a greater number of pygmy rabbits in the ecosystem shown in Figure: Sagebrush ecosystem without invasive cheatgrass than in the ecosystem shown in Figure: Sagebrush ecosystem with invasive cheatgrass.

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