In an experiment to investigate osmosis, cylinders of parsnip are placed in different concentrations of sucrose solution. At a sucrose concentration of 0.0 mol/dm30.0 \text{ mol/dm}^30.0 mol/dm3, the mass of a parsnip cylinder increases by 24%24\%24%. The percentage change in mass of the parsnip cylinders decreases by 8%8\%8% for every 0.15 mol/dm30.15 \text{ mol/dm}^30.15 mol/dm3 increase in sucrose concentration. Assuming a linear relationship between sucrose concentration and percentage change in mass, calculate the x-axis intercept for the parsnip cylinder. This represents the concentration of sucrose that has the same water potential as the parsnip cells.
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.