A-LevelBiologyCell membranes and transport9700/12 · Oct/Nov 2020 · Q161 Mark
Four agar blocks are stained green using universal indicator and suspended in 1 moldm⁻³ hydrochloric acid. [Figure 16.1] The time taken for the agar blocks to change from green to red was recorded. Which agar block would be the first to become completely red?
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A2 cm x 2 cm x 2 cm
B2 cm x 1 cm x 4 cm
C2 cm x 3 cm x 2 cm
D5 cm x 2 cm x 3 cm
✓ Correct answer
B: 2 cm x 1 cm x 4 cm
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