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A-LevelBiologyCell membranes and transportMay/June 2024Paper 1 Q171 Mark

A red indicator solution was mixed with agar and the resulting solid was cut into small cylindrical blocks. The blocks were placed in an acid which turns the indicator yellow and all other variables were kept constant. The dimensions of the blocks are shown. block 1 height 3 mm diameter 6 mm block 2 height 6 mm diameter 12 mm block 3 height 8 mm diameter 16mm The formula for calculating the surface area of a cylinder is 2πrh + 2πr². The formula for calculating the volume of a cylinder is πr²h. Which row shows the correct surface area (SA) to volume (V) ratio for each block and the time taken for the block to turn yellow? [Table showing SA to V ratio and time to turn yellow for block 1, block 2, and block 3]

A0.75:1.0 4 1.5:1.0 5 2.0:1.0 11
B0.75:1.0 11 1.5:1.0 5 2.0:1.0 4
C1.33:1.0 4 0.67:1.0 5 0.5:1.0 11
D1.33:1.0 11 0.67:1.0 5 0.5:1.0 4

✓ Correct Answer

The correct answer is C. 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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About This A-Level Biology Question

This multiple-choice question appeared in the Cambridge A-Level Biology (9700) May/June 2024 examination, Paper 1 Variant 2. It tests the topic of Cell membranes and transport and is worth 1 mark.

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