What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to respiration. 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 respiration, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying respiration is breathing.
- Saying plants respire only at night.
- Writing the photosynthesis equation as the respiration equation, so that oxygen appears as a product.
- Saying oxygen is the molecule that holds the energy released.
- Writing glycogen or starch in the respiration equation instead of glucose.
- Saying anaerobic respiration releases more energy because it is used in a hard sprint.
- Saying anaerobic respiration in muscle produces alcohol, or that yeast produces lactic acid.
- Saying the oxygen debt is the oxygen you failed to breathe in during the exercise, rather than the extra oxygen needed afterwards to clear the lactic acid.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Respiration revision notes.