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| # | Exam Name | Board | Exam Date |
|---|---|---|---|
| 1 |
Solved Paper
|
Test |
Aug
06
2026
|
| 2 |
Solved Paper
|
NEET |
May
12
2026
|
| 3 |
Solved Paper
|
JEE |
Jan
24
2026
|
| S.No. | Question & Answer |
|---|---|
| 1 | What is denitrification? — The conversion of nitrates (NO₃⁻) back into atmospheric nitrogen (N₂), completing the cycle. |
| 2 | Why is nitrification essential for plants? — Because ammonia is toxic to plants. |
| 3 | How does nitrification occur? — It converts ammonia into nitrites by Nitrosomonas, and then into nitrates by Nitrobacter. |
| 4 | What is assimilation in the nitrogen cycle? — The process where plants absorb nitrogen as ammonium, nitrate, nitrite, or amino acids, passing it into the food chain. |
| 5 | What is ammonification (mineralization)? — The conversion of organic nitrogen from dead organisms into ammonium. |
| 6 | What is nitrogen fixation? — The conversion of atmospheric nitrogen into ammonia, aided by lightning or diazotrophs with the nitrogenase enzyme. |
| 7 | How do terrestrial and aquatic ecosystems differ in nitrogen fixation? — In terrestrial ecosystems, symbiotic microbes fix nitrogen; in aquatic ecosystems, free-living microbes dominate. |
| 8 | Which human activities have altered the nitrogen cycle? — Fossil fuel combustion, fertilizer use, and wastewater release. |
| 9 | What role does nitrogen availability play in ecosystems? — It influences primary productivity and decomposition. |
| 10 | Why is atmospheric nitrogen not directly usable by most organisms? — It is in a form not directly usable by most organisms, making available nitrogen a limiting nutrient. |
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