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Questions and Answers
What is the main force responsible for the movement of water in xylem conduits?
What is the main force responsible for the movement of water in xylem conduits?
- Positive pressure
- Guttation
- Cohesion-tension hypothesis (correct)
- Casparian strip
What is the function of the Casparian strip in plants?
What is the function of the Casparian strip in plants?
- It allows for the movement of water and solutes through the apoplast.
- It regulates the positive pressure in herbaceous plants during guttation.
- It prevents the movement of water and solutes through the apoplast. (correct)
- It facilitates the movement of water and solutes from the root cortex to the vascular cylinder.
What is the purpose of the Casparian strip in plant roots?
What is the purpose of the Casparian strip in plant roots?
- To prevent the movement of water through the apoplast (correct)
- To attract water molecules to each other
- To transport soil solutes into root cells
- To create positive pressure for guttation
How does guttation occur in plants?
How does guttation occur in plants?
What drives the bulk flow of water and minerals from roots to shoots in plants?
What drives the bulk flow of water and minerals from roots to shoots in plants?
What causes guttation in plants?
What causes guttation in plants?
What drives the bulk flow of water and minerals from roots to shoots in plants?
What drives the bulk flow of water and minerals from roots to shoots in plants?
What is the cohesion-tension hypothesis?
What is the cohesion-tension hypothesis?
What creates the cohesive forces that hold the continuous column of water in the xylem conduits together?
What creates the cohesive forces that hold the continuous column of water in the xylem conduits together?
What creates the surface tension at the air-water interface in plants?
What creates the surface tension at the air-water interface in plants?
What is the main cause of water movement into the root cortex of plants?
What is the main cause of water movement into the root cortex of plants?
What is the main purpose of the root cortex in plants?
What is the main purpose of the root cortex in plants?
What is the main force responsible for the movement of water into the vascular cylinder of a plant?
What is the main force responsible for the movement of water into the vascular cylinder of a plant?
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Study Notes
- Water in soil moves into vascular cylinder of plant.
- Soil solutes transported into root cells lower water potential, creating gradient for water to move into root cortex.
- Sap travels to vascular cylinder for ascent; movement through apoplast stopped by Casparian strip.
- Water pulled up by tension or pushed up by positive pressure in short herbaceous plants.
- Guttation occurs from positive pressure but is limited to herbaceous plants and works only at night.
- Water in xylem conduits pulled by negative pressure due to transpiration.
- Surface tension created at air-water interface by attraction of water molecules to each other.
- Bulk flow of water and minerals from roots to shoots driven by surface tension at air-water interface.
- Cohesion-tension hypothesis explains ascent of water in continuous column held together by cohesive forces.
- Hydrogen bonding of water molecules to each other creates cohesive forces.
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