A farmer adds a fertiliser containing nitrate ions to a field.
What do the crop plants use these ions to make?
Starch for storage in their cells
Amino acids for making their proteins
Glucose for use in their respiration
Cellulose for building their cell walls
44 exam-style questions on Edexcel GCSE Biology 9.3 Material cycles and decomposition, covering 9.3.1 Cycling of materials through ecosystems, 9.3.2 The carbon cycle, 9.3.3 The water cycle, 9.3.4 The nitrogen cycle, 9.3.5 Indicator species and pollution, 9.3.6 Decomposition in preservation and composting, and 9.3.7 Rate changes in decay of biological material. Each one has a worked solution and a mark scheme showing where the marks go.