A student compares diffusion through membranes of different thicknesses. The student also uses a larger membrane area with each thicker membrane.
Why can the effect of thickness alone not be determined?
Increasing thickness speeds diffusion, while increasing area slows diffusion.
Increasing thickness and increasing area both slow the rate of diffusion.
Increasing thickness and increasing area both speed the rate of diffusion.
Increasing thickness slows diffusion, while increasing area speeds 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.