The process of nitrogen – fixation by bacteria does not take place in the presence of ___________ .
A. molecular form of hydrogen
B. elemental form of oxygen
C. water
D. elemental form of nitrogen.
Answer:B
The process of nitrogen – fixation by bacteria does not take place in the presence of ___________ .
A. molecular form of hydrogen B. elemental form of oxygen C. water D. elemental form of nitrogen.