(B) In paddy (rice) fields,$BGA$ (Blue-Green Algae),such as $Anabaena$ and $Nostoc$,serve as important biofertilisers.These organisms are capable of f

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(B) In paddy (rice) fields,$BGA$ (Blue-Green Algae),such as $Anabaena$ and $Nostoc$,serve as important biofertilisers.These organisms are capable of fixing atmospheric nitrogen,which enhances the fertility of the soil and promotes the growth of the rice crop.