Biology 9700 · AS & A Level · Infectious diseases

Infectious diseases — practice question

Large populations of anaerobic bacteria are present in waterlogged soils. How does this affect soil fertility, and why?

  • Asoil fertility decreased; bacteria convert nitrate to ammonia
  • Bsoil fertility decreased; bacteria convert nitrate to nitrogen gas
  • Csoil fertility increased; bacteria cause decomposition
  • Dsoil fertility increased; bacteria cause nitrogen fixation

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