Question

Choose the correct answer from the alternatives given.
Which of the following is a correct statement about nitrogen fixation?

• A. Plants convert atmospheric nitrogen to ammonia
• B. Ammonia is converted to nitrates, which is the part of nitrogen most easily absorbed by plants
• C. Mutant strains of Rhizobium are able to secrete excess nitrogen into the soil
• D. Enzyme nitrogenase reduces $N_2$ to form ammonia

Answer 1

The correct option is D Enzyme nitrogenase reduces $N_2$ to form ammonia

Nitrogenases are enzymes that are produced by certain bacteria, such as cyanobacteria. These enzymes are responsible for the reduction of nitrogen to ammonia.

So the correct answer is "Enzyme nitrogenase reduces N2 to form ammonia".