LIFE SCIENCE

Detailed explanation-1: -The nitrogen molecule is composed of two nitrogen atoms joined by a triple covalent bond, thus making the molecule highly inert and nonreactive. Nitrogenase catalyzes the breaking of this bond and the addition of three hydrogen atoms to each nitrogen atom.

Detailed explanation-2: -So, the correct answer is ‘Nitrogen fixation’.

Detailed explanation-3: -Bacteria and archaea in the soil and in the roots of some plants have the ability to convert molecular nitrogen from the air (N2) to ammonia (NH3), thereby breaking the tough triple bond of molecular nitrogen. Such organisms are called “diazotrophs".

Detailed explanation-4: -Bacteria in the soil, water, and plant roots are responsible for biological nitrogen fixation. These bacteria use cellular energy and enzymes to break apart atmospheric nitrogen atoms and fix the nitrogen into compounds where the nitrogen is available for use by plants.