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8.1 Exchange surfaces and diffusion

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Question 15
H

Amoeba is a single-celled organism. A human is a large multicellular organism.

Explain why a human needs specialised exchange surfaces and a transport system, but Amoeba does not.

[6]
Markscheme

8.1 Exchange surfaces and diffusion Questions

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

42 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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