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CAIE A-Level Biology 4.2.4 Investigating Surface-Area-to-Volume Ratio

Practise testing diffusion with differently sized indicator-agar blocks by controlling solution, temperature and time, then comparing percentage volume penetrated rather than raw…

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • prepare geometrically similar agar blocks with accurately measured different dimensions
  • control acid or dye concentration, volume, temperature and exposure time across blocks
  • calculate percentage volume penetrated and relate larger ratios to faster complete diffusion

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