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CAIE A-Level Biology 4.2.3 Surface-Area-to-Volume Ratios

Practise calculating surface area, volume and their ratio for biological shapes with consistent units, then relate a larger ratio and shorter diffusion distance to faster exchange.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • calculate total exposed surface area and volume from the stated three-dimensional shape
  • express surface area to volume as a simplified ratio with dimensions measured consistently
  • connect a larger ratio and shorter diffusion distance with more effective exchange

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