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प्रश्न
The process of nitrogen-fixation by bacteria does not take place in the presence of
विकल्प
the molecular form of hydrogen
the elemental form of oxygen
water
the elemental form of nitrogen
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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संबंधित प्रश्न
Name four types of bacteria involved in nitrogen cycle.
How is nitrogen replenished in atmosphere.
Match the following.
| Microorganism | Role Played |
| Nitrosomonas | Nitrogen fixation |
| Azotobacter | Ammonification |
| Pseudomonas species | Nitrification |
| Putrefying bacteria | Denitrification |
Suggest a suitable word for the following statement.
Agent which spreads pathogens from one place to another.
Why should we avoid standing dose to a tuberculosis patient while he/she is coughing?
Polio drops are not given to children suffering from diarrhoea. Why?
How do vaccines work?
The blue-green algae that take part in nitrogen fixation are also called ______.
Nitrogen is an essential component of protein, DNA, and chlorophyll.
Assertion (A): Plants and animals can utilize atmospheric nitrogen.
Reason (R): The atmosphere is a rich source of nitrogen.
