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
Exam points
- Explain the role of hydrogen bonding and cohesion in water movement through xylem.
CAIE A-Level Biology AS 7.2.4 Hydrogen Bonding in Water Movement Questions question 1
[Maximum number: 1]
Which statement helps to explain why water molecules are forced to move through xylem vessel elements as a consequence of transpiration?
A
Water molecules form hydrogen bonds with cellulose in the walls of xylem vessel elements in a process known as adhesion.
B
Water molecules form hydrogen bonds with neighbouring water molecules in a process known as cohesion.
C
Water molecules form ionic bonds with dissolved mineral ions, which helps to keep the water molecules together in a continuous column.
D
Water has a high latent heat of vaporisation and this prevents the evaporation of water in the xylem vessel elements.
B
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