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प्रश्न
Long Answer Question:
Explain biological nitrogen fixation with example.
थोडक्यात उत्तर
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
Name four types of bacteria involved in nitrogen cycle.
Describe nitrogen cycle.
Very Short Answer Question:
Name the bacteria responsible for conversion of nitrite to nitrate.
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Which of the following is TRUE regarding Rhizobium?
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The blue-green algae that take part in nitrogen fixation are also called ______.
Assertion (A): Plants and animals can utilize atmospheric nitrogen.
Reason (R): The atmosphere is a rich source of nitrogen.
How are organisms like Pseudomonas and Thiobacillus of great significance in nitrogen cycle?
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 |
