IB Biology SL B3.2.8 Xylem Vessel Adaptations Questions

Explore how dead hollow xylem tubes, lignified walls and pits support low-resistance water transport under tension in IB Biology SL B3.2.8.

Exam points

Explain how dead, hollow xylem vessels with absent or perforated end walls form continuous low-resistance tubes for water flow.
Explain how lignified xylem walls resist collapse under negative pressure and help waterproof and support the vessel.
Explain how pits or pores permit lateral movement of water between xylem vessels and surrounding tissues.

[Maximum number: 2]

Plants require water that is carried through xylem vessels.

Outline two adaptations of xylem vessels for water transport.
1.
2.

All question bank results loaded