IB ESS HL 2.5.9 Community Development Influences Question Bank
Evaluate how abiotic conditions, species interactions and chance influence succession.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify the HL succession mechanism or community concept
- trace the relevant species, productivity or management change
- evaluate assumptions and ecological evidence
2.5.9 (HL)—Community development influences question 1
[Maximum number: 4]
Outline one climatic and one edaphic (soil) factor which affect the final climax community in an ecosystem.
Climatic:
amount of precipitation / insolation / (mean) temperature;
limit primary productivity/rate of photosynthesis that will determine the available biomass/food base/on which climax community will depend;
Edaphic:
soil depth / mineral content/amount of N/P/K / soil compaction/aeration / soil particle size / balance between clay, silt and sand / percolation rate / soil pH;
determine the particular vegetation types/plant species adapted to those conditions that support the climax community;
Marking guidance:
Award up to [2 max] for climatic factor and up to [2 max] for edaphic factor.
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