What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to organisms and their environment. 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 organisms and their environment, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Drawing food chain arrows from the eater to the eaten.
- Saying the first trophic level gains energy by eating plants.
- Calling a decomposer a carnivore, or leaving decomposers out of the chain altogether.
- Saying carnivores obtain energy from every trophic level.
- Saying food chains are short because of competition, rather than because of energy loss between levels.
- Saying the energy lost between levels simply disappears, without naming respiration, faeces, excretion or uneaten parts.
- Saying plants do not respire, or that plants only respire at night, in the carbon cycle.
- Saying plants absorb nitrogen gas from the air.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Organisms and their environment revision notes.