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Explain the Conversion of atmospheric Nitrogen to plant ?
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Answer Posted / sai
Food in the soil:-This conversion is brought about by following ways:
(a) By lightening
(b) By Symbiotic Bacteria
(c) By other methods as manufacture of Nitric Acid by Ostwald process. Manufacture of NH3 by Haber process. In these process free N2 of air is used Conversion of nitrogen compound in soil into plant and animal proteins:-In the body of plant nitrogenous compounds are converted into organic compounds known as proteins
These proteins are taken up by animals and digested by animals, which form amino acids.
Ammonifications:- Excess of nitrogen in the body of animals is eliminated as urine.
When animals and plants die off, the waste products of death and decay is converted into ammonia.
Nitrification:- Ammonia and ammonium salts are oxidized in soil to nitrites by nitrosifying bacteria and then to nitrates by Nitrifying bacteria. Nitrates serve the function of food for plants. Thus, through ammonification and nitrification the nitrogen which the plant get form soil is returned to soil again
Denitrification :- In the soil the nitrogenous compounds which are present are decomposed by denitrifying bacteria. With this part of nitrogen is again ser free which escapes in atmosphere.
In this way a continuous cycle is going on in nature.
Fixation of Nitrogen:- The nitrogen present in the compounds in known as fixed or combined nitrogen. The conversion of free nitrogen into nitrogenous compounds is known as fixation of nitrogen
Passivity:- The inertness exhibited by substances under conditions in which chemical activity is to be expected is known as passivity. The cause of this phenomenon is formation of a thin film of oxide on the surface of metal and this film of oxide prevents the corrosion of metal. This property is shown by iron, cobalt, nickel and chromium
Rushing of iron :- Rust is a mixture of ferric hydroxide and ferric oxide. It is produced by action of water on iron in presence of dissolved oxygen.
Prevention of Rushing:-
(1)By metallic coatings e.g. of tin, nickel zinc, aluminium etc.. on metal
(2)Protection by oxide, phosphate or other chemical coatings
(3)Protection by paints and enamels
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