A student prepared a microscope slide using cells from the lining of the inside of the mouth. The cells were placed in a concentrated salt solution. After 5 minutes, the cells had become smaller.
Explain why the cells became smaller.
140 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.