Describe the roles that microorganisms have in the global cycles of nitrogen (N) or sulphur (S)?...

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Biology

Describe the roles that microorganisms have in the globalcycles of nitrogen (N) or sulphur (S)?

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Nitrogen cycle has five stepsNitrogen fixation N2 to NH3 NH4 or NO3Nitrification NH3 to NO3Assimilation Incorporation of NH3 and NO3 into biologicaltissuesAmmonification organic nitrogen compounds to NH3DenitrificationNO3 to N2Nitrogen is a key component of the bodies of living organismsIt exists in the atmosphere as gasThe nitrogen cycle is a seriesof processes that convert nitrogen gas to organic substances andback to nitrogen in nature It is a continuous cycle that ismaintained by the decomposers and nitrogen bacteriaNitrogenfixing microorganisms capture atmospheric nitrogenandconvertit to ammonia whichistaken by plants and used to make organic moleculesThe nitrogen compounds are passed through the food chain as otherorganisms feed on the plants and each otherWaste productsundigested food urine and faeces and dead organisms whichcontain nitrogen compounds are added to the soilTwo kinds of nitrogenfixing bacteria are there The firstfreeliving nonsymbiotic bacteria includes the cyanobacteria orbluegreen algae Anabaena and Nostoc and generasuch as Azotobacter Beijerinckia andClostridium The second one is comprises the mutualisticsymbiotic bacteria examples include Rhizobiumassociated with leguminous plants eg various members of the peafamily Frankia associated with certain dicotyledonousspecies actinorhizal plants and certain See Answer

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