An aquatic organism releases carbon dioxide into still water. The water near its surface is then continuously replaced with water containing less carbon dioxide.
What is the initial effect on net carbon dioxide diffusion out of the organism?
It decreases because the concentration difference becomes greater.
It increases because the concentration difference becomes smaller.
It decreases because the concentration difference becomes smaller.
It increases because the concentration difference becomes greater.
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.