A plant root took up 2.4 mg of nitrate ions by active transport in 40 minutes.
Calculate the mean rate of nitrate ion uptake in μg\mu\text{g}μg per minute.
The concentration of nitrate ions inside the root cells is 850 times the concentration in the soil water. The concentration in the soil water is 0.02 mmol per dm3\text{dm}^3dm3 .
Calculate the concentration of nitrate ions inside the root cells.
Give your answer in mmol per dm3\text{dm}^3dm3 .
Explain what these figures show about the way nitrate ions enter the root cells.
Give one use of nitrate ions in a plant.
58 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.