(A) The bacterium $Rhizobium$ $leguminosarum$ lives symbiotically in the root nodules of leguminous plants like pea ($Pisum$ $sativum$).These bacteria

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(A) The bacterium $Rhizobium$ $leguminosarum$ lives symbiotically in the root nodules of leguminous plants like pea ($Pisum$ $sativum$).These bacteria possess the enzyme nitrogenase,which is responsible for the biological nitrogen fixation,converting atmospheric nitrogen $(N_2)$ into ammonia $(NH_3)$.