Properties of Water in Plant Transport
Understanding the roles of cohesion, adhesion, and surface tension of water in facilitating its movement through the xylem.
What is Properties of Water in Plant Transport?
The attraction between molecules of the same substance, in this case, water molecules.
Key points
- Define cohesion, adhesion, and surface tension of water.
- Explain how these properties contribute to the ascent of sap.
- Relate the properties of water to the transpiration pull mechanism.
- Understand the importance of these properties for plant survival.
Common exam trap
Confusing cohesion and adhesion.
Definitions
- Term
Cohesion
- Meaning
The attraction between molecules of the same substance, in this case, water molecules.
- Term
Adhesion
- Meaning
The attraction between molecules of different substances, in this case, water molecules and the walls of the xylem vessels.
- Term
Surface Tension
- Meaning
A property of liquids arising from intermolecular forces, causing the surface layer to behave like an elastic sheet.
- Term
Ascent of Sap
- Meaning
The upward movement of water and dissolved minerals from the roots to the aerial parts of a plant through the xylem.
- Term
Transpiration Pull
- Meaning
The force generated by the evaporation of water from the leaf surface (transpiration) that pulls the water column up through the xylem.
Learning objectives
Define cohesion, adhesion, and surface tension of water.
Explain how these properties contribute to the ascent of sap.
Relate the properties of water to the transpiration pull mechanism.
Understand the importance of these properties for plant survival.
Prerequisites
Basic understanding of plant anatomy (xylem).
Knowledge of molecular structure of water.
Concept of intermolecular forces (hydrogen bonding).
Common mistakes
Confusing cohesion and adhesion.
Underestimating the role of physical properties of water compared to active transport.
Not understanding how these properties collectively overcome gravity.
Ignoring the contribution of surface tension.
Keywords
Cohesion
Adhesion
Surface Tension
Water Properties
Ascent of Sap
Xylem Transport
Transpiration Pull
Hydrogen Bonding
Capillary Action
Practice preview
Which property of water is primarily responsible for its ability to form a continuous column in the xylem vessels, preventing it from breaking under tension?…
easy
The upward movement of water in plants is facilitated by the attraction of water molecules to the walls of xylem vessels. This phenomenon is known as:…
easy
In a tall tree, the water column in the xylem is under significant negative pressure (tension) due to transpiration. Which of the following properties of water is most critical for preventing the cavitation (formation of…
medium