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8.1 Exchange surfaces and diffusion

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Question 26

Respiring plant cells are grown beneath an oxygen-permeable film. Oxygen crosses a 20 μm20\,\mu\mathrm{m}20μm thick film at a rate of 7.0 arbitrary units. The film is replaced with one that is 5 μm5\,\mu\mathrm{m}5μm thick, without changing the exposed area or the concentration difference.

Using Fick's law, what diffusion rate is expected with the replacement film?

[1]
A

7.07.07.0 arbitrary units

B

1.751.751.75 arbitrary units

C

282828 arbitrary units

D

222222 arbitrary units

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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