IB Biology HL 4.2.9 Biomagnification
Practise analysing HL pollutant data, trophic-level risk, named chemicals and the trade-offs of DDT and plastic pollution.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse trophic-level data to explain pollutant accumulation and relative contamination risk.
- Evaluate biomagnification evidence using named chemicals, food webs and indicator species.
- Assess DDT or plastic-pollution trade-offs using health, ecological and control evidence.
D4.2.9—Biomagnification question 1
The diagram shows levels of DDT, a pesticide, in an aquatic food web in Lake Kariba, Africa. Numbers represent ppm (parts per million) of DDT in fat tissue.
Justify the observation that the crocodile has a higher mean DDT level than the cormorant or tigerfish.
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