The surface area of a membrane doubles and its thickness also doubles. The concentration difference and all other factors remain constant.
Using Fick's law, what happens to the diffusion rate?
It becomes twice the original rate.
It remains equal to the original rate.
It becomes half the original rate.
It becomes four times the original rate.
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.