CAIE A-Level Biology AS 7.2.4 Hydrogen Bonding in Water Movement Questions
Explain cohesion and hydrogen bonding in xylem water movement using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Explain cohesion and hydrogen bonding in xylem water movement using evidence from each question and mark scheme.
Hydrogen bonding is important in the movement of water in xylem.
Outline how hydrogen bonding is involved in water transport in the xylem of a plant stem.
any three from:
1 ref. to cohesion between water molecules ;
2 ref. to adhesion / hydrogen bonding, between water molecules and, cellulose / hydrophilic parts of lignin (in cell wall) ;
A hydrophilic parts of cell wall
3 formation of continuous column / AW ;
4 (column) pulled up by, transpiration / evaporation / transpiration pull ;