A) Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
B) Root nodule forming nitrogen 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
Correct Answer: C
Solution :
Phosphorus is, a component of DNA and RNA but not proteins.
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