Biology·MCQ Practice

Nitrogen Cycle — MCQ Practice

NEET UG

Version 1Updated 21 Mar 2026

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Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 6 questions available.

Q1medium

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

Q2medium

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

Q3easy

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

Q4medium

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

Q5medium

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

Q6easy

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