A-LevelBiologyCell membranes and transportOct/Nov 2024Paper 1 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?
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
The correct answer is D. This question tests the candidate's understanding of cell membranes and transport within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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