Nitrogen Is the Most Abundant Element in the Atmosphere, and a Crucial

Multiple Choice

Nitrogen is the most abundant element in the atmosphere, and a crucial component of proteins, vitamins, and nucleic acids. However, plants and other producers cannot use nitrogen in its natural form (N₂) . Nitrogen has to undergo a process called nitrogen fixation. What does this process involve?

A) It is undertaken by denitrifying bacteria.
B) Nitrogen is accumulated in dead organic matter.
C) Ammonia is converted to nitrate.
D) Nitrate is converted to ammonia.
E) It is the synthesis of ammonia from nitrogen gas by certain bacteria.