In vertical farming systems, hydroponics is frequently used to optimize the yield of leafy green crops like pak choi (Brassica rapa var. chinensis).
Describe an experimental investigation to determine how the concentration of nitrogen in the hydroponic nutrient solution affects the rate of growth (measured as the accumulation of dry biomass) of young pak choi plants.
74 exam-style questions on Edexcel IGCSE Biology Food production. Each one has a worked solution and a mark scheme showing where the marks go.