Question

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 nitrogen fixers live as aerobes
• C. Phosphours is a constituent of all members ,certain
  nucleic acids and all proteins
• D. Nitrosomonas and Nitrobacter are chemoautotrophs

Answer 1

The correct option is B Root nodule forming nitrogen fixers live as aerobes

Anabaena and Nostoc are also free-living nitrogen fixers.

Root nodule forming nitrogen fixers enzyme (nitrogenase) works only under the anaerobic condition.

Phosphorus is a constituent of cell membranes as a phospholipid, in nucleic acid as phosphate group and proteins are rich in phosphorus.

Nitrosomonas and Nitrobacter play an important role in nitrification. They are chemoautotrophs.

So the correct answer is 'Root nodule forming nitrogen fixers live as aerobes under free-living conditions'