IB ESS HL 2.5.7 Succession Changes Over Time Questions
Explain how vegetation, soil, food webs and species diversity change across successional stages using ecological evidence.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify changes in vegetation cover or community composition over time during succession using figure evidence
- explain how succession increases soil fertility and resilience through weathering, organic matter, decomposition, nutrient cycling, roots and soil development
- outline how a food web changes during succession through additional species, trophic levels, branching, biomass, productivity and decomposer prominence
- compare pioneer-stage and climax-stage soil quality, including organic matter, available minerals, organisms, nutrient cycling, vegetation cover and erosion risk
- explain why species diversity changes between successional stages using habitat availability, productivity, nutrient cycling, richness and evenness
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IB ESS HL 2.5.7 Succession Changes Over Time Questions question 1
Table:Organisms found in each successional stage
Figure:Keen's mouse in three successional stages
An area of temperate coniferous forest was deforested and allowed to regenerate. A survey of species numbers was conducted in three successional stages. The results of the survey are summarized in Table: Organisms found in each successional stage.
Explain why the diversity changes in the different successional stages.
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