A student left potato tissue in a concentrated sugar solution. The tissue lost mass, but the concentration of potassium ions inside the cells did not fall. Which explanation fits both observations?
Water left the cells by osmosis, while potassium ions were held in by active transport
Water left the cells by osmosis, while potassium ions left the cells by active transport
Water left the cells by active transport, while potassium ions were held in by osmosis
Water left the cells by diffusion, while potassium ions left the cells by diffusion
58 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.