The table shows concentrations of a solute on opposite sides of a membrane before and after a change.
Table
| Condition | Left concentration in arbitrary units | Right concentration in arbitrary units |
|---|---|---|
| Before | 15 | 5 |
| After | 18 | 13 |
The membrane area also doubles. Thickness, temperature and membrane material remain unchanged.
Using Fick's law, what happens to the net diffusion rate from left to right?
It remains equal to the original rate.
It becomes twice 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.