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 under free living conditions.
• C. Phosphorus is a constituent of cell membranes, 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 under free living conditions.

• 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'.