A-LevelBiologyCell membranes and transportOct/Nov 2013Paper 1 Q51 Mark
Many single-celled animals, living in fresh water, possess vacuoles which contract regularly, expelling excess water. Why do the cells of plants living in fresh water not require such vacuoles?
APlant cells have a higher concentration of dissolved solutes than animal cells.
BPlant cell walls are impermeable to water.
CPlant cell walls limit cell size.
DWater movement into plants is controlled by their roots.
✓ Correct Answer
The correct answer is C: Plant cell walls limit cell size.
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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