IB ESS SL 4.4.5 Eutrophication Question Bank
Explain causes and consequences of eutrophication.
- 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
4.4.5—Eutrophication question 1
[Maximum number: 1]
| Pollutant | Unit | 2011 | 2012 | 2013 | 2014 | 2015 |
|---|---|---|---|---|---|---|
| Nitrate | kt | 32.80 | 32.60 | 31.30 | 37.10 | 32.90 |
| Phosphate | kt | 4.50 | 4.40 | 4.00 | 4.80 | 4.40 |
| Lead | kg | 186.18 | 215.91 | 201.00 | 41.21 | 3.57 |
| Chromium | kg | 508.68 | 460.10 | 438.05 | 266.65 | 93.59 |
Pollutants in wastewater discharged into Beijing rivers, 2011-2015
Figurewastewater pollutants
• Nitrate (kt): 2011 32.80; 2012 32.60; 2013 31.30; 2014 37.10; 2015 32.90.
• Phosphate (kt): 2011 4.50; 2012 4.40; 2013 4.00; 2014 4.80; 2015 4.40.
• Lead (kg): 2011 186.18; 2012 215.91; 2013 201.00; 2014 41.21; 2015 3.57.
• Arsenic (kg): 2011 28.09; 2012 21.34; 2013 15.11; 2014 8.00; 2015 11.04.
• Mercury (kg): 2011 1.72; 2012 0.49; 2013 0.64; 2014 0.10; 2015 0.33.
• Cadmium (kg): 2011 12.44; 2012 17.90; 2013 17.45; 2014 0.58; 2015 0.70.
• Chromium (kg): 2011 508.68; 2012 460.10; 2013 438.05; 2014 266.65; 2015 93.59.
With reference to Figure, identify the year in which eutrophication was most likely to have occurred.
2014
Note: Only mark the first answer if more than one year is given.
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