Question

The biological conversion of ammonium to nitrite and then to nitrate is called .

• A. nitrogen fixation
• B. nitrification
• C. ammonification
• D. denitrification

Answer 1

The correct option is B nitrification

Nitrification is the biological conversion of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate.

The process of conversion of atmospheric nitrogen to forms that are usable for the plants is termed as nitrogen fixation.

Ammonification is the decomposition of organic nitrogen from dead plants and animals into gaseous ammonia.

The biological reduction of nitrate to nitrogen gas by facultative heterotrophic bacteria is called denitrification.