IB Biology B3.2.8 Xylem vessel adaptations
IB Biology B3.2.8 Xylem vessel adaptations
Practise explaining how xylem vessel structure supports efficient water transport and plant support, including comparisons with phloem.
How this is tested
- outline how hollow, dead vessels reduce resistance to water flow
- explain how lignified walls support xylem and prevent collapse under tension
- distinguish xylem and phloem structures when transport tissues are compared