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8.1 Exchange surfaces and diffusion

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Question 19

A computer model compares four proposed versions of an exchange surface with its current version. The measurements used by the model are shown below.

VersionSurface area in mm²Concentration difference in arbitrary unitsMembrane thickness in mm
Current6040.30
A9040.45
B3040.60
C12020.60
D12040.40

The temperature and membrane material are the same for every version.

Using Fick's law, which proposed version has the same net diffusion rate as the current version?

[1]
A

Version D

B

Version A

C

Version B

D

Version C

Markscheme

8.1 Exchange surfaces and diffusion Questions

  1. GCSE
  2. /Biology
  3. /8.1 Exchange surfaces and diffusion

102 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.

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