Multiple Choice
What process does water use to move across the plasma membrane?
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6. The Membrane
Osmosis
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How does the cell wall protect a plant cell from bursting in a hypotonic solution?
A
By allowing water to freely enter and exit the cell
B
By actively pumping water out of the cell
C
By providing structural support to prevent excessive expansion
D
By making the cell membrane impermeable to water
Verified step by step guidance1
Understand the concept of osmosis: In a hypotonic solution, the concentration of solutes outside the cell is lower than inside, causing water to move into the cell by osmosis.
Recognize the role of the cell wall: Plant cells have a rigid cell wall made of cellulose that provides structural support and limits the extent to which the cell can expand.
Identify the effect of water influx: As water enters the plant cell, the cell swells, but the cell wall exerts a counter pressure called turgor pressure, which prevents the cell from bursting.
Differentiate from other mechanisms: Unlike animal cells, plant cells do not rely on mechanisms like active pumping of water or impermeability of the membrane to prevent bursting.
Conclude the protective role: The cell wall's rigidity and ability to withstand internal pressure are crucial in maintaining cell integrity in hypotonic environments.
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