IB ESS HL 2.5.8 Disturbance Tolerance Question Bank
Evaluate how ecosystems respond to disturbance and the factors controlling tolerance.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Evaluate how ecosystems respond to disturbance and the factors controlling tolerance.

Figure:Stages of ecological succession after fire
Outline two reasons why the climax community in the succession model shown above is more stable than the intermediate community.
greater number of species/habitat/ecological niches/genetic diversity in climax community; gross productivity/stored biomass is higher in climax community; more complex/diverse energy pathways/food webs; more established nutrient cycling; more favourable abiotic conditions/soil properties; more established negative feedback mechanisms;