-Consider the global nitrogen cycle depicted in the accompanying figure. What is the limiting portion of the cycle for plants?
A) industrial nitrogen fixation
B) nitrogen lost to the atmosphere
C) internal nitrogen cycling in the oceans
D) nitrogen fixation by bacteria

Question

-Consider the global nitrogen cycle depicted in the accompanying figure. What is the limiting portion of the cycle for plants?
A) industrial nitrogen fixation 
B) nitrogen lost to the atmosphere 
C) internal nitrogen cycling in the oceans 
D) nitrogen fixation by bacteria

Quizplus · Accepted Answer

Nitrogen fixation by bacteria is the primary natural method through which inert atmospheric nitrogen is converted into forms usable by plants, making it a critical and often limiting step in the nitrogen cycle for plant growth.

-Consider the Global Nitrogen Cycle Depicted in the Accompanying Figure