Which process converts atmospheric nitrogen into a usable form for plants?
A
Photosynthesis
B
Respiration
C
Nitrogen fixation
D
Transpiration
Correct Answer: Option C — Nitrogen fixation
Explanation:
Nitrogen fixation is carried out by certain bacteria that convert inert atmospheric nitrogen gas into ammonia or related compounds usable by plants. This process is essential for building proteins and nucleic acids in living organisms.