In an experiment to determine the water potential of sweet potato cells, uniform discs of sweet potato are immersed in glucose solutions of varying concentrations. At a glucose concentration of 0.0 mol/dm30.0 \text{ mol/dm}^30.0 mol/dm3, the mass of the sweet potato discs increases by 27%27\%27%. The percentage change in mass of the discs decreases by 6%6\%6% for every 0.12 mol/dm30.12 \text{ mol/dm}^30.12 mol/dm3 increase in glucose concentration.
Assuming a linear relationship between glucose concentration and the percentage change in mass, calculate the glucose concentration at which there is no net change in the mass of the sweet potato discs. State the units of your answer.
82 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.