A student investigates osmosis in potatoes. A balance adds 0.20 g to every reading. A cylinder's true initial mass is 4.00 g and its true final mass is 4.40 g.
How does the balance error affect the calculated results?
the mass gain is too high; the percentage gain is too high
the mass gain is too low; the percentage gain is too low
the mass gain is correct; the percentage gain is too low
the mass gain is correct; the percentage gain is too high
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.