Question

describe nitrogen cycle​

Answer 1

$\huge{\bf{\underline{\underline{\purple{Answer :}}}}}$

Nitrogen Cycle :

• Nitrogen Cycle is the bio-giochemical cycle in which nitrogen change into simple compound and enter into living being and form complex compound then these complex compound break down into simple compound and release into back atmosphere .
• Nitrogen Cycle divided into Five steps :

→Nitrogen Fixation

→Nitric Fixation

→Assimilation

→Ammonification

→Dentrifixation

$\bold{\bf{\green{Nitrogen \ Fixation :}}}$

⇒Atmosphere Nitrogen cannot be used by plant and animals directly , it needs to get converted into Nitrogen Compound .

$\implies \bold{N_{2} \frac{Rizobium bacteria }{Leguminous \ plant} > {NH_{3} [ Ammonia ] , NH_{4} [Ammonium]}}}$

$\bold{\bf{\green{Nitric \ Fixation :}}}$

⇒Some Nitrifying bacteria convert ammonia to nitrite and then Nitrate because $\bold{NH_{3}}$ [ ammonia] is highly toxic .

$\implies \bold{NH_{3} , NH_{4} \frac{Nitrozomes bacteria } {-} > NO_{2} [ Nitrite] , NO_{3} [ Nitrate ]}$

⇒By lightning , Some amount of atmospheric nitrogen is Converted into $\bold{NH_{3} \ or \ {NH_{4}}}$

$\bold{\bf{\green{Assimilation :}}}$

⇒ Nitrogen Compound in various form such as Nitrite , Nitrate , Ammonia , Ammonium are taken up from soil by plants  which are used to form Plant & Animal protein .

$\bold{\bf{\green{Ammonifixation :}}}$

⇒Dead plant and Animals or their waste contains organic nitrogen compound which when enters into the soil fungi  and bacteria converts it back to ammonia .

$\bold{\bf{\green{Dentrification : }}}$

⇒ In this process nitrate is converted back into gaseous nitrogen. [Dentrifying bacteria use oxygen of nitrates in ammonia respiration] Example Micrococcus , serriatia etc

Answer 2

Answer:

• The atmospheric nitrogen cannot be taken directly by the plants and animals.

• Certain bacteria and blue green algae process of soil fix nitrogen from atmosphere, can convert it into compounds of nitrogen.

• After the conversion, these usable compounds are utilised by plants from the soil through their root system.

• Nitrogen stain used for synthesis of plant protein and other compounds.

• Animals feeding on plants get these proteins and other nitrogen compounds.

• When plants and animals die, bacteria and fungi present in the soil convert the nitrogenous wastes into nitrogenous compounds to be used by the plants again.

• Certain other bacteria convert some part of them nitrogen gas which goes back into the atmosphere.

•As a result, the percentage of nitrogen in the atmosphere remains more or less constant.

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