LIFE SCIENCE

Detailed explanation-1: -Nitrogen is essential for all living things because it is a major part of amino acids.

Detailed explanation-2: -Although nitrogen is incredibly abundant in the air we breathe, it is often a limiting nutrient for the growth of living organisms. This is because the particular form of nitrogen found in air-nitrogen gas-cannot be assimilated by most organisms.

Detailed explanation-3: -All plants under cultivation, except legumes (plants with seed pods that split in half, such as lentils, beans, peas or peanuts) get the nitrogen they require through the soil. Legumes get nitrogen through fixation that occurs in their root nodules, as described above.