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प्रश्न
The process of nitrogen-fixation by bacteria does not take place in the presence of
पर्याय
the molecular form of hydrogen
the elemental form of oxygen
water
the elemental form of nitrogen
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उत्तर
the elemental form of oxygen
Explanation:
Nitrogen fixation is the conversion of inert atmosphere nitrogen or dinitrogen (N2) into utilisable compounds of nitrate, ammonia, amino acids. Various bacteria like Rhizobium and Azotobacter convert the atmospheric nitrogen into water-soluble nitrates. The nitrogenase enzyme is a prime requirement for biological nitrogen fixation. This enzyme is vulnerable to oxygen and gets destroyed in its presence. It is due to this reason, that most nitrogen-fixing bacteria live in anaerobic conditions or sequester oxygen with the proteins like leghaemoglobin.
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Match Column - I with Column - II.
| Column - I | Column - II | ||
| (a) | Nitrococcus | (i) | Denitrification |
| (b) | Rhizobium | (ii) | Conversion of ammonia to nitrite |
| (c) | Thiobacillus | (iii) | Conversion of nitrite to nitrate |
| (d) | Nitrobacter | (iv) | Conversion of atmospheric nitrogen to ammonia |
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| Column A | Column B (Organisms) | ||
| (1) | Symbiotic nitrogen fixation | (a) | Nitrobacter |
| (2) | Denitrification | (b) | Cyanobacteria |
| (3) | Free living nitrogen fixers | (c) | Rhizobium |
| (4) | Nitrification | (d) | Paracoccus |
