Which one of the following is wrong statement?

(a) Anabaena and Nostoc are capable of fixing nitrogen in free-living state also

(b) Root nodule forming nirogen fixers live as aerobes under free-living conditions

(c) Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins

(d) Nitrosomonas and Nitrobacter are chemoautotrophs

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