(A) $Nif$ genes are present in $Rhizobium$. These genes are responsible for the synthesis of the enzyme nitrogenase,which is essential for fixing atmo

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(A) $Nif$ genes are present in $Rhizobium$. These genes are responsible for the synthesis of the enzyme nitrogenase,which is essential for fixing atmospheric nitrogen. $Rhizobium$ $leguminosarum$ bacteria are found in a symbiotic association within the root nodules of leguminous plants.