Q. Which one of the following is a wrong statement?
A) Nitrosomonas and Nitrobacter are chemoautotrophs
B) Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
C) Root nodule forming nitrogen fixers live as aerobes under free-living conditions
D) Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins
Explanation
[Solution from source] Phosphorus is a constituent of cell membranes (phospholipids), all nucleic acids and certain proteins, not all proteins, so the statement given is wrong. Nitrosomonas and Nitrobacter are chemoautotrophs, Anabaena and Nostoc fix nitrogen when free-living, and Rhizobium lives as an aerobe when free-living. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.