Question

The process of converting atmospheric nitrogen into a form usable by plants is called:

• A. Nitrification
• B. Denitrification
• C. Nitrogen fixation
• D. Ammonification

Hint:

Nitrogen fixation = Making atmospheric N usable for plants.

Answer 1

The Correct Option is C

Nitrogen fixation is the process where atmospheric nitrogen (N$_2$) is converted into ammonia (NH$_3$) by certain bacteria, making nitrogen available to plants. This can be biological (e.g., Rhizobium in legumes) or industrial (Haber-Bosch process).