Atmospheric nitrogen is
A) used directly by plants.
B) used directly by animals.
C) turned into ammonia by microorganisms.
D) directly used to make carbohydrates.
E) converted into urea by bacteria.

Question

Quizplus · Accepted Answer

Atmospheric nitrogen cannot be directly used by plants or animals. It requires the process of nitrogen fixation by nitrogen-fixing bacteria to be converted into a usable form such as ammonia. Once it is converted to ammonia, other soil bacteria can convert it to other forms like nitrites and nitrates that can be taken up by plant roots.

Atmospheric Nitrogen Is