A student estimates the concentration at which potato cylinders show no percentage mass change. The student accidentally leaves surface solution on every cylinder when measuring its final mass. All initial masses were measured after blotting.
The true percentage mass change decreases steadily as sugar concentration increases.
How is the estimated concentration likely to be affected?
it is too high because the percentage mass changes are shifted upwards
it is too low because the percentage mass changes are shifted upwards
it is too high because the percentage mass changes are shifted downwards
it is too low because the percentage mass changes are shifted downwards
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.