Question

Nitrogen fixation is __________.

A. Absorbing N2 from the soil
B. converting nitrogen in the air to a form usable by plants
C. recycling nitrogen from organic matter in the soil
D. performed by fungus inhabiting root nodules
E. using nitrogen to build molecules such as proteins and nucleic acids

Answer 1

Nitrogen fixation is the process where nitrogen-fixing bacteria convert atmospheric nitrogen into a form usable by plants, primarily through the production of ammonia. Option b.

Step-by-step explanation:

Nitrogen fixation is the process by which nitrogen-fixing bacteria convert atmospheric nitrogen (N₂) into ammonia (NH₃), a form that can be used by plants to synthesize organic compounds such as proteins and nucleic acids. This conversion is crucial for the growth of plants, as atmospheric nitrogen is not directly usable by them. Nitrogen fixation enriches the soil by adding essential nitrogen in a biologically accessible form and is a key component of the nitrogen cycle in terrestrial ecosystems. The process is primarily carried out by bacteria, some of which form symbiotic relationships with the roots of legume plants, enabling these plants to thrive in nitrogen-poor soils.

The correct answer to the question is B. converting nitrogen in the air to a form usable by plants.