In a model exchange surface, the area decreases by 25% and the membrane thickness increases by 50%. The concentration difference and all other factors remain constant.
Using Fick's law, what percentage of the original diffusion rate remains?
25%25\%25%
75%75\%75%
50%50\%50%
112.5%112.5\%112.5%
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.