IB ESS HL 2.5.9 Hl Community Development Influences Questions
Explain how climatic, edaphic and geological conditions influence community development and plant colonisation in named sites.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- outline climatic and edaphic factors, such as precipitation, temperature, insolation, soil depth, mineral content, pH or texture, that influence the vegetation and final climax community
- suggest and explain why plant diversity or colonisation differs between named volcanic or disturbed sites using bedrock or ash, weathering, climate, seed-source biodiversity, dispersal and human activity evidence
IB ESS HL 2.5.9 Hl Community Development Influences Questions 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.
All question bank results loaded