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A-LevelBiologyCell membranes and transport9700/12 · May/June 2024 · 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]

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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

C: 1.33:1.0 4 0.67:1.0 5 0.5:1.0 11

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About this question

Topic
Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source
A-Level Biology, May/June 2024 Paper 1 Variant 2, question 17.

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