Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

When an indicator is combined with agar, it produces a pink colour. If this pink agar is placed in acid, it turns colourless. Pink agar blocks are cut into different sizes and then placed in acid. All the other variables are kept the same. Which block turns colourless the fastest?

  • A3 mm \times 30 mm \times 30 mm
  • B6 mm \times 6 mm \times 6 mm
  • C6 mm \times 12 mm \times 12 mm
  • D12 mm \times 12 mm \times 12 mm

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