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8.1 Exchange surfaces and diffusion

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Question 20
F

A student models an organism as a cube with sides of 3 mm.

For a cube, surface area =6l2 and volume =l3=l^3=l3, where l l\,l is side length.

What is the surface area to volume ratio of this model?

[1]
A

1:21:21:2

B

6:16:16:1

C

2:12:12:1

D

9:19:19:1

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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