Ammonium produced by urea can be absorbed by roots or it can

Answer: Option A

Ammonium produced by urea can be absorbed by roots or it can change to nitrate.
Plants absorb nitrogen in the form of ammonia and nitrate during the assimilation process. When nitrogen nutrients have served their purpose in plants and animals, it is covered back into ammonia and water-soluble ammonium salts by the process of ammonification. And further, bacteria will convert them back into nitrite and nitrate through the process of nitrification.