IB ESS HL 4.4.5 Eutrophication Question Bank

Explain causes and consequences of eutrophication.

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

[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.

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4.4.5—Eutrophication question 1