What this practice covers
These questions are drawn from past CIE 9700 Biology papers and filtered to structure of transport tissues. 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 structure of transport tissues, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying xylem cells are alive. They are dead at maturity, and this is why they work.
- Saying lignin makes the wall permeable. It makes it impermeable, and pits are the exception that lets water pass.
- Saying sieve tube elements have no cytoplasm. They have a thin layer; what they lack is a nucleus.
- Attributing the ATP for phloem loading to the sieve tube element. It comes from the companion cell.
- Putting phloem on the inside of a stem vascular bundle. Xylem is the inner tissue.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Structure of transport tissues revision notes.