A-LevelBiologyCell membranes and transportOct/Nov 2018Paper 1 Q191 Mark
Agar cubes can be used to demonstrate the effect of changing surface area to volume ratio on diffusion. Three different agar cubes made using a dilute acid were placed into an indicator solution that diffused into the cubes. When the indicator came into contact with the acid it changed colour. The cubes were 1cm³, 2cm³ and 3cm³ and were left in the indicator solution for 10 minutes. All other variables were kept the same. The results for the 2 cm³ cube are shown. Which diagrams represent the results for the 1 cm³ and the 3cm³ cubes?
A[Diagram A]
B[Diagram B]
C[Diagram C]
D[Diagram D]
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of cell membranes and transport within the Biologysyllabus. The examiner's mark scheme requires...
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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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