What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to human influences on ecosystems. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on human influences on ecosystems, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Pairing deforestation with acid rain, or with eutrophication.
- Saying deforestation lowers carbon dioxide because fewer trees respire.
- Saying deforestation raises both carbon dioxide and oxygen.
- Giving "provides land for farming" as an undesirable effect of deforestation.
- Saying eutrophication poisons the fish, rather than removing their oxygen.
- Saying the algae themselves use up the oxygen. The decomposers do, as they break the dead algae down.
- Blaming warming on the greenhouse effect existing, rather than on its enhancement.
- Saying carbon dioxide causes acid rain. Sulfur dioxide and oxides of nitrogen do.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Human influences on ecosystems revision notes.