The plasmid of which one of the following has ‘nif’ gene in it?

 The plasmid of which one of the following has ‘nif’ gene in it?

(a) Rhizobium

(b) Agrobacterium tumefaciens

(c) Bacillus thuringiensis

(d) Salmonella typhimurium

Answer (a) : The nif gene is a nitrogen fixing gene found in bacterium Rhizobium.