IB Biology HL 4.2.8 Nutrient Cycling and Eutrophication
Practise analysing HL eutrophication evidence, including fertilizer use, algal blooms, oxygen demand and aquatic stability.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Evaluate fertilizer use as a cause of nutrient enrichment and eutrophication.
- Explain algal blooms, oxygen depletion and BOD changes using aquatic data.
- Assess ecological consequences of eutrophication for reefs and aquatic stability.
D4.2.8—Eutrophication 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
2 max
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