Pollution

20.3

What the syllabus asks of you

Describe the effects of untreated sewage and 4 Explain the process of eutrophication of water, excess fertiliser on aquatic ecosystems limited to: • increased availability of nitrate and other ions • increased growth of producers • increased decomposition after death of producers • increased aerobic respiration by decomposers • reduction in dissolved oxygen • death of organisms requiring dissolved oxygen in water
Describe the effects of non-biodegradable plastics, in both aquatic and terrestrial ecosystems
Describe the sources and effects of pollution of the air by methane and carbon dioxide, limited to: the enhanced greenhouse effect and climate change

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Chapter 19: Effects of humans on ecosystems

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Every question on Pollution, untimed, marked as you go.

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