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

Explore how cell geometry links surface area to exchange, volume to metabolic demand and low ratios to diffusion limits in IB Biology SL B2.3.6.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

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.
  • Interpret cell geometry, graphs or red-cell evidence to compare surface area, volume and exchange efficiency.

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

[Maximum number: 2]

The following shows an electron micrograph of a liver cell.

Figure for Question IB Biology SL B2.3.6 Surface Area to Volume Ratios Questions question 1 — IB Biology SL

Outline the significance of the relationship between the surface area and volume of a cell.

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