17 Questions
What is the function of the tonoplast in a cell?
Regulates the movement of water and solutes in and out of the vacuole
Placing water under tension in a plant cell would have what effect on the water potential?
Reduces the water potential
What is the main function of the cytoplasm in a cell?
Contains organelles like mitochondria and ribosomes
How does adding solutes to a solution affect the water potential?
Decreases free energy and increases water potential
Which part of a plant cell acts as a selective barrier regulating the movement of substances into and out of the cell?
Tonoplast
Placing a flaccid cell in a weak sucrose solution would most likely result in what movement of water?
No movement of water into or out of the cell
What is the relationship between hydrostatic pressure, solute potential, and water potential in a plant cell?
Hydrostatic pressure is positive, solute potential is negative, and water potential is the sum of the two
How does wilting affect turgor pressure in plant cells?
Turgor pressure decreases as cells dry out and lose access to water
What causes the process of plasmolysis in plant cells?
Severe dehydration or wilting
How does the disequilibrium in water potential affect cell volume?
It drives water entry into the cell, increasing cell volume by stretching the wall
What role does turgor pressure play in cell wall expansion?
Turgor pressure creates a stress that loosens the cell wall for expansion
What process must occur to fully restore turgor pressure in a plant cell after expansion?
Increasing solute intake into the cell
What is the term for the pressure exerted by water inside the vacuole of a plant cell?
Turgor pressure
Which component of a plant cell is primarily responsible for maintaining turgor pressure?
Tonoplast
In plant cells, what is the primary function of the tonoplast?
Controlling water balance in the vacuole
Which structure in a plant cell is directly involved in the uptake and storage of water?
Vacuole
Among the listed components, which one acts as a selective barrier regulating the movement of substances in and out of a plant cell?
Plasma membrane
Test your knowledge on water potential in mature plant cells, including the impact of hydrostatic pressure, solute potential, and water movement. Explore how water enters and exits cells, affecting the overall water potential.
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