Denitrifying bacteria convert

  1. ammonium into nitrates
  2. nitrogen gas into nitrates
  3. amino acids into protein
  4. nitrates into nitrogen gas
Answer

D) nitrates into nitrogen gas

Denitrification returns N₂ to the air. O Level Biology · Topic 19 Relationships of Organisms with One Another and with the Environment · 19.2 Nutrient cycles

Biology MCQ · More O Level Biology: Organisms and the Environment MCQs · Practise