Question

QUESTION -:


Explain about these :

(i) Nitrogen Fixation
(ii) Biological Fixation
(iii) Non - Biological Fixation

Quality answers are appreciated...​

Answer 1

Answer:

1.the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycl.

Explanation:

2.Biological nitrogen fixation (BNF) is the term used for a process in which nitrogen gas (N2) from the atmosphere is incorporated into the tissue of certain plants. Only a select group of plants is able to obtain N this way, with the help of soil microorganisms.

3.non-biological nitrogen fixation is achieved by lightning converting nitrogen and oxygen into nitrogen oxides. Nitrogen oxides may react with water to make nitrous acid or nitric acid,which seeps into the soil , where it makes nitrate , which growing plants can easily use it.

Answer 2

Answer:

(i)

Nitrogen Fixation is a biological process in which the nitrogen gas is converted into a usable form for plants and other microbes. In this process, nitrogen gas present in the atmosphere is converted into ammonia and other related nitrogenous compounds.

(ii)

Biological nitrogen fixation is the term used for a process in which nitrogen gas (N2) from the atmosphere is incorporated into the tissue of certain plants. ... Among forage plants, the group of plants known as legumes are well known for being able to obtain N from air N2.

(iii)

Non biological nitrogen fixation is achieved by lightning converting nitrogen and oxygen into nitrogen oxides. Nitrogen oxides may react with water to make nitrous acid or nitric acid,which seeps into the soil , where it makes nitrate , which growing plants can easily use it.

Explanation:

In nitrogen fixation process, nitrogen in the atmosphere is converted into ammonia (another form of nitrogen) by certain bacterial species like Rhizobium, Azotobacter, etc. and by other natural phenomena.

Plants are the main sources of food. The nutrients obtained from plants are synthesized by plants using various elements which they obtain from the atmosphere as well as from the soil. This group of elements includes nitrogen as well. Plants obtain nitrogen from the soil and utilise in the process of protein synthesis. Unlike carbon dioxide and oxygen, atmospheric nitrogen cannot be obtained through stomata of leaves. Because the nitrogen gas present in the atmosphere can not be directly used by plants. There are certain bacteria and some natural phenomenon which help in Nitrogen fixation.

Biological nitrogen fixation is carried out by a specialized group of prokaryotes. These organisms utilize the enzyme nitrogenase to catalyze the conversion of atmospheric nitrogen (N2) to ammonia (NH3). Plants can readily assimilate ammonia to produce the aforementioned nitrogenous biomolecules. These prokaryotes include aquatic organisms, such as cyanobacteria, free-living soil bacteria, such as Azotobacter, bacteria that form associative relationships with plants, such as Azospirillum, and most importantly, bacteria, such as Rhizobium and Bradyrhizobium, that form symbioses with legumes and other plants.

In non biological fixation of nitrogen when the plant dies the fixed nitrogen is released making it available to other plants and this helps to fertilize the soil. The great majority of legumes have this association but a few genera do not. In farming practices fields are rotated through various crops like clover and buckwheat which are known as green manure.