A-LevelBiologyCell membranes and transport9700/12 · Oct/Nov 2024 · Q161 Mark
In an experiment, pieces of onion epidermis are put into three different concentrations of sucrose solutions, P, Q and R. The pieces of onion are left for an hour and then examined using the low power of a light microscope. Each diagram shows one cell from the epidermis that was placed in each of the sucrose concentrations. What explains the appearance of cells in solution Q?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThe concentration of solution Q is equal to the concentration of the solutes in the cell sap.
BThe cytoplasm has the same concentration of sucrose as solution Q.
CThe water potential of the cytoplasm is equal to the water potential of the vacuole.
DThe water potential of the cell sap is equal to the water potential of solution Q.
✓ Correct answer
D: The water potential of the cell sap is equal to the water potential of solution Q.
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