Advertisements
Advertisements
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
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Define chemoautotrophs.
Draw diagram of Nitrogen cycle.
Write a note on nitrogen fixation?
Long Answer Question:
Explain biological nitrogen fixation with example.
Which free living microorganism helps in nitrogen fixation?
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?
Suggest a suitable word for the following statement.
Agent which spreads pathogens from one place to another
Polio drops are not given to children suffering from diarrhoea. Why?
What is nitrification?
Match the following:
| 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 |
