Bacteria in a soil sample convert ammonium compounds into nitrates. The soil becomes waterlogged and the oxygen available to these bacteria decreases.
What is the most likely result?
Less nitrification occurs, so fewer nitrates become available to roots.
More nitrification occurs, so more nitrates become available to roots.
Less nitrogen fixation occurs, so more nitrates become available to roots.
More nitrogen fixation occurs, so fewer nitrates become available to roots.
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.