A-LevelBiologyTransport in plants9700/12 · May/June 2019 · Q221 Mark
What is correct for phloem sieve tube elements?
ACompanion cells provide structural support to the phloem sieve tube elements.
BLignified walls of phloem sieve tube elements prevent transport of mineral salts by mass
flow.
CPhloem sieve tube elements become narrower as movement of sucrose occurs.
DPlasmodesmata allow movement of water and solutes across cell walls of phloem sieve tube
elements.
✓ Correct answer
D: Plasmodesmata allow movement of water and solutes across cell walls of phloem sieve tube elements.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Transport in plants and see which topics are most likely to come up next.
Sign up free →