IB ESS SL 4.4.6 Eutrophication Sequence Question Bank
Trace nutrient enrichment, algal growth, oxygen depletion and ecosystem change.
- Syllabus
- First assessment 2026
- Course
- ESS SL
- Level
- SL
Exam points
- identify the aquatic-system process or pollution indicator
- apply the relevant conservation, quality or management model
- evaluate ecological and human trade-offs from evidence
4.4.6—Eutrophication sequence question 1
Figure:pH-tolerance ranges of freshwater organisms
the pH-tolerance ranges of freshwater organisms below shows the ranges of pH over which different types of aquatic organisms in a small lake can survive.
Use the pH-tolerance ranges of freshwater organisms: the pH tolerance ranges of trout, bass, perch, frogs, salamanders, clams, crayfish, snails and mayfly in the small lake.
Explain why the populations of remaining organisms in the lake may decline in the long term.
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