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Question
Which of the following processes releases nitrogen back into the atmosphere?
I. Nitrification
II. Denitrification
Ill. Nitrogen fixation
Which of the following processes releases nitrogen back into the atmosphere?
I. Nitrification
II. Denitrification
Ill. Nitrogen fixation
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Solution
The correct option is C II only
I. The conversion of ammonia to nitrate is called nitrification. It is performed in two steps, first, nitrite is formed and then nitrate is formed.II. Nitrate present in the soil is converted to atmospheric nitrogen by the process of denitrification by denitrifying bacteria, present in the soil.III. Nitrogen fixation is the conversion of atmospheric molecular nitrogen into usable forms of nitrogen like nitrate, nitrite, ammonia, etc. Nitrogen is present in the atmosphere as N2 which cannot be utilized directly by the plants. So, it is converted or fixed into usable form by the action of microbes like nitrogen-fixing bacteria and by processes like lightning.So, the correct answer is option B.
I. The conversion of ammonia to nitrate is called nitrification. It is performed in two steps, first, nitrite is formed and then nitrate is formed.
II. Nitrate present in the soil is converted to atmospheric nitrogen by the process of denitrification by denitrifying bacteria, present in the soil.
III. Nitrogen fixation is the conversion of atmospheric molecular nitrogen into usable forms of nitrogen like nitrate, nitrite, ammonia, etc. Nitrogen is present in the atmosphere as N2 which cannot be utilized directly by the plants. So, it is converted or fixed into usable form by the action of microbes like nitrogen-fixing bacteria and by processes like lightning.
So, the correct answer is option B.
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