Question

2p
Q.3. Which group of bacteria use
nitrogen gas from the air to produce
their own nitrate?
Denitrifying bacteria
Nitrifying bacteria
Nitrogen-fixing bacteria
All the above​

Answer 1

Answer:

Denitrification. Denitrification completes the nitrogen cycle by converting nitrate (NO3-) back to gaseous nitrogen (N2). Denitrifying bacteria are the agents of this process. These bacteria use nitrate instead of oxygen when obtaining energy, releasing nitrogen gas to the atmosphere

Answer 2

Answer:

Nitrogen -fixing bacteria

Explanation:

Nitrogen-fixing bacteria in the soil and within the root nodules of some plants convert nitrogen gas in the atmosphere to ammonia. Nitrifying bacteria convert ammonia to nitrites or nitrates. Ammonia, nitrites, and nitrates are all fixed nitrogen and can be absorbed by plants.