A farmer adds too much fertiliser to a field.
The soil water becomes more concentrated than the cytoplasm of the root hair cells.
Which statement explains why the plants in the field wilt?
Mineral ions enter the root hair cells by active transport, so less water is needed.
Water enters the root hair cells by diffusion, so the cells take up too much water.
Mineral ions leave the root hair cells by osmosis, so the cells lose their turgor.
Water leaves the root hair cells by osmosis, so less water reaches the xylem.
114 exam-style questions on OCR GCSE Biology 2.2 The challenges of size, covering 2.2.1 Exchange surfaces and surface area : volume ratio, 2.2.2 Substances transported in organisms, 2.2.3 The human circulatory system, 2.2.4 The heart and blood vessels, 2.2.5 Red blood cells and plasma, 2.2.6 Uptake of water and mineral ions by plants, 2.2.7 Transpiration and translocation, 2.2.8 Xylem and phloem, 2.2.9 Environmental factors and water uptake, and 2.2.10 Using a potometer. Each one has a worked solution and a mark scheme showing where the marks go.