Nitrogen Metabolism — Practice Quiz
Telangana Open School (TOSS) · Class 12 · Biology
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What is the most abundant gas in the Earth's atmosphere?
Which form of nitrogen can plants directly absorb from the soil?
Which of the following is a free-living nitrogen-fixing bacterium?
What is the main product of biological nitrogen fixation?
Sample Questions
Which enzyme is responsible for converting nitrate to nitrite in plants?
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Nitrate reductase
Nitrate reductase catalyzes the reduction of nitrate (NO₃⁻) to nitrite (NO₂⁻) in plants.
Which of the following is NOT a step in the nitrogen cycle?
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Photosynthesis
Photosynthesis is part of the carbon cycle, not the nitrogen cycle. The nitrogen cycle includes fixation, assimilation, ammonification, nitrification, and denitrification.
What is the chemical formula of ammonia?
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NH₃
Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.
Which of the following organisms performs symbiotic nitrogen fixation?
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Rhizobium
Rhizobium forms a symbiotic relationship with leguminous plants and fixes nitrogen inside root nodules.
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