A gardener added too much fertiliser to the soil around some plants. The fertiliser dissolved in the soil water. A few days later, the plants began to wilt.
Explain why adding too much fertiliser caused the plants to wilt.
Some plants grow in very salty soil near the sea. The cytoplasm of their root hair cells contains a very high concentration of dissolved substances.
Suggest how this helps these plants to take in water from the salty soil.
41 exam-style questions on Edexcel GCSE Biology 1.4 Transport across cell membranes, covering 1.4.1 Transport into and out of cells and 1.4.2 Percentage gain and loss in osmosis. Each one has a worked solution and a mark scheme showing where the marks go.