IB Biology HL D4.2.8 Eutrophication Questions
Analyse how nitrate and phosphate enrichment drives algal blooms, oxygen demand and aquatic ecosystem harm.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Trace nitrate or phosphate runoff from land to algal blooms, decomposition, increased BOD and hypoxia.
- Explain how decomposition of algal biomass raises biochemical oxygen demand and lowers dissolved oxygen, harming aquatic organisms.
- Evaluate eutrophication effects on aquatic habitats, biodiversity and ecosystem stability using fertilizer-leaching evidence.
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IB Biology HL D4.2.8 Eutrophication Questions question 1
[Maximum number: 2]
Most reef-building corals contain photosynthetic algae, called Zooxanthellae, that live in their cells. Coral bleaching can occur as a result of human-induced changes leading to the Zooxanthellae being ejected from the coral.
A coat of algae builds up on coral reefs as a consequence of eutrophication.
Explain the relationship between eutrophication and algal growth.
a. eutrophication is nutrient enrichment of a body of water
b. example of nutrients
c. «nutrients» serve as fertilizer for the algae «promoting growth»
eg: nitrates
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