IB Biology SL 4.2.8 Nutrient Cycling and Eutrophication
Practise explaining peat formation and how nutrient leaching changes oxygen conditions in aquatic ecosystems.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain peat formation from accumulated plant material and limited decomposition.
- Link nutrient leaching and algal growth to oxygen loss during eutrophication.
D4.2.8—Eutrophication question 1
[Maximum number: 1]
What directly causes oxygen levels to drop during eutrophication in aquatic ecosystems?
A
Increased photosynthesis by aquatic plants
B
Enhanced respiration by fish
C
More decomposition of organic matter by bacteria
D
Lower levels of nitrogen in the water
C
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