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प्रश्न
Long Answer Question:
Explain biological nitrogen fixation with example.
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उत्तर
Biological nitrogen fixation:
- It is carried out by prokaryotes called as ‘Nitrogen fixers’ or Diazotrophs’.
- It accounts for nearly 70% of natural nitrogen fixation.
- Nitrogen fixers are either symbiotic or free living.
- Symbiotic N2 fixation: The best-known nitrogen-fixing symbiotic bacterium is Rhizobium. This soil living/ dwelling bacterium forms root nodules in plants belonging to the family Fabaceae e.g. beans, gram, groundnuts etc.
- Azotobacter, Azospirillum is free-living nitrogen-fixing bacteria.
- The cyanobacteria fix a significant amount of nitrogen in specialized cells called heterocysts.
- Nitrogen fixation is high high-energy-requiring process and nitrogen fixers use 16 molecules of ATP to fix each molecule of nitrogen to form ammonia.
N2 + 8H+ + 8e- + 16ATP → 2NH3 + H2 + 16ADP + 16Pi
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संबंधित प्रश्न
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Write a note on nitrogen fixation?
Very Short Answer Question:
Name the bacteria responsible for conversion of nitrite to nitrate.
Write the role of nitrogenase enzyme in nitrogen fixation?
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______ is the primary nutrient, important for the survival of all living organisms.
In the Nitrification process, the ammonium compounds are oxidised to soluble ______.
Draw a neat flow chart of the Nitrogen cycle. Briefly explain the various processes involved in the nitrogen cycle.
Name the cell which is responsible for nitrogen fixation in cyanobacteria.
Name any two nitrifying bacteria in soil.
