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

question 97

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.

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