O-LevelBiologyEcology & Environment5090/11 · May/June 2023 · Q401 Mark
Drainage from fields where nitrogen-containing fertilisers have been spread can result in fish dying in rivers. Which sequence of events describes what happens when fish die as a result of water pollution by nitrogen-containing fertilisers?
Aless oxygen dissolved in the water → more growth of water plants → more plant decomposition by bacteria
Bless oxygen dissolved in the water → more plant decomposition by bacteria → less plant growth
Cmore growth of water plants → less plant decomposition by bacteria → more oxygen dissolved in the water
Dmore growth of water plants → more plant decomposition by bacteria → less oxygen dissolved in the water
✓ Correct answer
D: more growth of water plants → more plant decomposition by bacteria → less oxygen dissolved in the water
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