The gill exchange surface of fish P has half the surface area and one third of the membrane thickness of the gill exchange surface of fish Q. The concentration difference and all other factors are the same.
Using Fick's law, which statement describes the diffusion rate across the gills of fish P?
It is three times the rate in fish Q.
It is one and a half times the rate in fish Q.
It is one sixth of the rate in fish Q.
It is two thirds of the rate in fish Q.
102 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.