What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to transport in animals. 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.
Start practising practice questions →
What examiners see students get wrong here
These are the errors that cost marks on transport in animals, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Defining an artery as a vessel carrying oxygenated blood, which fails for the pulmonary artery.
- Saying the pulmonary vein carries deoxygenated blood.
- Sending blood to an organ down a vein, for example writing "aorta to renal vein".
- Saying the left ventricle is thicker because it pumps more blood. It pumps at higher pressure.
- Saying valves are opened by muscles rather than by pressure differences.
- Saying both sets of valves are closed while the ventricles contract.
- Giving arteries valves.
- Saying capillary walls are thin "to let blood through". They are one cell thick to shorten the diffusion distance.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Transport in animals revision notes.