Plants absorb nitrogen from the soil mainly as

  1. amino acids
  2. ammonia gas
  3. nitrogen gas
  4. nitrate ions
Answer

D) nitrate ions

Roots take up nitrate ions. 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