Nitrogen Cycle — Prelims Questions

Which of the following bacterial genera is primarily responsible for converting nitrite ($NO_2^-$) to nitrate ($NO_3^-$) in the nitrogen cycle?

Which of the following statements about biological nitrogen fixation is INCORRECT?

Which of the following processes in the nitrogen cycle is carried out under anaerobic conditions?

Which of the following is NOT a form of nitrogen that plants can directly absorb from the soil?

Which of the following groups of organisms contributes significantly to free-living nitrogen fixation in soil?

The conversion of organic nitrogen into ammonia by decomposers is known as: