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IB Biology HL B2.3.6 Surface Area to Volume Ratios Questions

Surface area supports material exchange; volume reflects metabolic demand, so a growing cell eventually cannot exchange fast enough for its needs.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that surface-area-to-volume ratio decreases as a cell grows because volume increases faster than surface area.
  • Relate cell surface area to exchange rate and cell volume to metabolic demand or waste production.
  • Explain how a low surface area-to-volume ratio slows diffusion and limits cell size.

IB Biology HL B2.3.6 Surface Area to Volume Ratios Questions question 1

[Maximum number: 1]

State what change there has been in the cell surface area to volume ratio in red blood cell 1.

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