| Movement into and out of Cells |
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Why does diffusion stop when equilibrium is reached?
Diffusion stops at equilibrium because there is no concentration gradient, so there is no net movement of particles
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Explain why a red blood cell placed in distilled water bursts, but a plant cell does not?
RBC lacks a cell wall; plant cell has a rigid cell wall.
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Why does active transport stop immediately when respiration is inhibited in a cell?
Respiration stops, so ATP is unavailable.
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A plant cell becomes flaccid instead of plasmolysed in a certain solution. What does this indicate about the solution’s water potential?
The solution has equal or slightly lower water potential than the cell.
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Two plant cells, X and Y, are placed in the same hypertonic solution. After 30 minutes, cell X is fully plasmolysed, while cell Y is only partially plasmolysed, even though both cells are of the same type and size. Explain two possible reasons for this difference. Give one reason
Cell wall rigidity or elasticity differs, so protoplast shrinks differently.
OR Initial water potential or vacuole size may vary, affecting the extent of plasmolysis. |
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