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IB ESS HL 4.4.7 Eutrophication and Ecosystem Services Questions

Evaluate effects of eutrophication on ecosystem services.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • identify how nutrient pollution, eutrophication, algal blooms, oxygen depletion and dead zones affect aquatic food production and other ecosystem services
  • explain how excess nutrients reduce light and primary productivity, increase decomposition and oxygen demand, cause hypoxia or organism death, and disrupt aquatic food webs
  • analyse and evaluate impacts of eutrophication on aquatic food production using Gulf of Mexico or other case evidence, considering ecological feedbacks, livelihoods, food security and competing ecosystem services

IB ESS HL 4.4.7 Eutrophication and Ecosystem Services Questions question 1

[Maximum number: 4]
Figure Diagram showing the expanse of the Mississippi River basin draining into the Gulf of Mexico

Figure Diagram showing the expanse of the Mississippi River basin draining into the Gulf of Mexico

Figure Pie charts showing sources of nutrients delivered to the Gulf of Mexico from the Mississippi River

Figure Pie charts showing sources of nutrients delivered to the Gulf of Mexico from the Mississippi River

Explain how nutrient pollution could impact aquatic food production in the Gulf of Mexico.

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