What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to transport in plants. 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 transport in plants, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Putting water in the phloem or sugar in the xylem.
- Saying xylem is living, or that phloem is dead.
- Saying transpiration is evaporation from the stomata. The evaporation is from the mesophyll cell surfaces; the stomata are where the vapour diffuses out.
- Saying water is absorbed by the roots by active transport. Water enters by osmosis; the mineral ions use active transport.
- Answering "high temperature and still air" for the fastest transpiration.
- Saying high humidity speeds transpiration up because there is more water about. It slows it down, because the gradient is shallower.
- Describing translocation as one-way, from roots to leaves.
- Saying a potometer measures the rate of transpiration exactly, rather than the rate of water uptake.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Transport in plants revision notes.