. What is meant by 'nitrogen fixation' ? State two
ways in which nitrogen gas of the atmosphere can be 'fixed' in nature to get nitrogen compounds in the soil
Best Answer
The process of converting atmospheric nitrogen into compounds of nitrogen is called nitrogen fixation
The ways in which in which nitrogen gas of the atmosphere can be 'fixed' in nature to get nitrogen compounds in the soil are
(i) Nitrogen fixation by lightning: Lightning also help in fixing atmospheric nitrogen into the soil. The temperature and pressure during lightning convert atmospheric nitrogen into oxides of nitrogen. These nitrogen compounds combine with rain water to form nitric and nitrous acid which mix with the soil. These acids are utilized by various organisms
(ii) Nitrogen fixation by certain bacteria and blue green algae: Certain bacteria and blue
green algae present in the soil fix nitrogen from the atmosphere and convert it
into compounds of nitrogen
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