← Biology (4BI1)
Q1 / 5
Human influences on the environment
Higher
2 marks
How does eutrophication harm aquatic ecosystems?
A
Nitrates → algal bloom → blocks light → submerged plants die → decomposers use O₂ → aquatic organisms die (deoxygenation)
B
Fertilisers add oxygen to water, helping fish grow
C
Algae improve water quality by removing waste
D
Eutrophication only affects marine (saltwater) ecosystems
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