CourseCourseConceptConceptDocsDocuments

IB Biology SL D4.2.8 Eutrophication Questions

Trace how nutrient enrichment drives algal growth, decomposition and oxygen loss in aquatic ecosystems.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Link nitrate or phosphate enrichment to algal growth, decomposition and increased biochemical oxygen demand that lowers dissolved oxygen.

Learn this topic

Study D4.2.8—Eutrophication conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL D4.2.8 Eutrophication Questions question 1

[Maximum number: 1]

What directly causes oxygen levels to drop during eutrophication in aquatic ecosystems?

A

Increased photosynthesis by aquatic plants

B

Enhanced respiration by fish

C

More decomposition of organic matter by bacteria

D

Lower levels of nitrogen in the water

All question bank results loaded