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Questions and Answers
What process moves water across cell membranes in plants?
What process moves water across cell membranes in plants?
- Facilitated diffusion
- Active transport
- Osmosis (correct)
- Diffusion
When plant cells are in a hypertonic solution, what happens to the cells?
When plant cells are in a hypertonic solution, what happens to the cells?
- They lose water and shrink. (correct)
- They stay the same and maintain their shape.
- They gain water and become turgid.
- They burst due to excess water intake.
What is the condition of healthy plant cells when they are turgid?
What is the condition of healthy plant cells when they are turgid?
- Flaccid
- Shrivelled
- Turgid (correct)
- Turgor pressure is lost
What happens to the water potential when solutes are added to a solution?
What happens to the water potential when solutes are added to a solution?
What is the unit of measurement for water potential?
What is the unit of measurement for water potential?
Which direction does water move based on water potential?
Which direction does water move based on water potential?
What is the term used for the movement of materials between cells in plants?
What is the term used for the movement of materials between cells in plants?
What is the physical factor, in addition to cell walls, that contributes to the flaccidity of plant cells in a hypertonic solution?
What is the physical factor, in addition to cell walls, that contributes to the flaccidity of plant cells in a hypertonic solution?
In plant cells, what is the term for the pressure exerted by the entry of water in a hypotonic solution?
In plant cells, what is the term for the pressure exerted by the entry of water in a hypotonic solution?
What is the combined term for the physical and osmotic pressures in plant water potential calculations?
What is the combined term for the physical and osmotic pressures in plant water potential calculations?
In terms of water potential, what happens to ψ when solutes are added to a solution?
In terms of water potential, what happens to ψ when solutes are added to a solution?
What is the unit of measurement for water potential, symbolized by ψ?
What is the unit of measurement for water potential, symbolized by ψ?
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Study Notes
Osmosis in Plants
- Water moves across cell membranes in plants through the process of osmosis.
- When plant cells are in a hypertonic solution, they lose water and shrink, a condition known as plasmolysis.
- Healthy plant cells are turgid, meaning they are rigid and swollen due to the influx of water.
Water Potential
- The addition of solutes to a solution decreases its water potential.
- Water potential is measured in pressure units, typically in megapascals (MPa).
- Water moves from an area of high water potential to an area of low water potential.
- The term for the movement of materials between cells in plants is plasmodesmata.
Turgor Pressure
- The physical factor that contributes to the flaccidity of plant cells in a hypertonic solution is the loss of turgor pressure, in addition to the cell wall.
- Turgor pressure is the pressure exerted by the entry of water in a hypotonic solution.
Water Potential Calculations
- The combined term for the physical and osmotic pressures in plant water potential calculations is the water potential (ψ).
- When solutes are added to a solution, ψ (water potential) decreases.
- The unit of measurement for water potential is typically represented by ψ (psi) and is measured in megapascals (MPa).
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