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The common nitrogen-fixer in paddy fields is _________.
- a)Oscillatoria
- b)Frankia
- c)Rhizobium
- d)Azospirillum
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The common nitrogen-fixer in paddy fields is _________.a)Oscillatoriab...
- Atmospheric nitrogen is not available to plants. There are certain nitrogen-fixing bacteria that convert atmospheric nitrogen into ammonium compounds and make them available to the plants.Examples: Azotobacter, Frankia, Rhizobium, Azospirillum.
- Out of these, Azospirillum is widely used as a nitrogen fixer organism in paddy fields. It is used as a biofertilizer in rice fields. It promotes plant growth.
Hence, the correct option is D.
NCERT Reference: Topic- MICROBES AS BIOFERTILIZERS” of chapter "Microbes in Human Welfare" of NCERT.
NCERT Reference: Topic- MICROBES AS BIOFERTILIZERS” of chapter "Microbes in Human Welfare" of NCERT.
Most Upvoted Answer
The common nitrogen-fixer in paddy fields is _________.a)Oscillatoriab...
Common Nitrogen-Fixer in Paddy Fields
Nitrogen fixation is a crucial process in agriculture, particularly in rice cultivation. In paddy fields, certain microorganisms play a significant role in enhancing soil fertility.
Why Azospirillum?
Azospirillum is a genus of bacteria known for its ability to fix atmospheric nitrogen. Here’s why it is the common nitrogen-fixer in paddy fields:
Comparison with Other Options
- Oscillatoria: This is a genus of cyanobacteria, but it does not specifically enhance nitrogen fixation in paddy fields.
- Frankia: While it is a nitrogen-fixing actinobacterium, it primarily associates with non-leguminous plants, unlike Azospirillum, which is more relevant for paddy fields.
- Rhizobium: This genus is well-known for nitrogen fixation in legumes, but it does not play a significant role in rice cultivation.
Conclusion
In conclusion, Azospirillum's ability to thrive in paddy fields and its beneficial effects on rice plants make it the common nitrogen-fixer in these agricultural systems.
Nitrogen fixation is a crucial process in agriculture, particularly in rice cultivation. In paddy fields, certain microorganisms play a significant role in enhancing soil fertility.
Why Azospirillum?
Azospirillum is a genus of bacteria known for its ability to fix atmospheric nitrogen. Here’s why it is the common nitrogen-fixer in paddy fields:
- Association with Roots: Azospirillum forms a symbiotic relationship with the roots of rice plants, enhancing nutrient uptake.
- Soil Adaptation: It thrives in the flooded conditions typical of paddy fields, making it particularly effective in this environment.
- Growth Promotion: Besides fixing nitrogen, Azospirillum produces growth-promoting substances, benefiting the overall plant health.
- Non-Symbiotic Nature: Unlike Rhizobium, which requires a specific host plant (legumes), Azospirillum can associate with a wider range of plants, including rice.
Comparison with Other Options
- Oscillatoria: This is a genus of cyanobacteria, but it does not specifically enhance nitrogen fixation in paddy fields.
- Frankia: While it is a nitrogen-fixing actinobacterium, it primarily associates with non-leguminous plants, unlike Azospirillum, which is more relevant for paddy fields.
- Rhizobium: This genus is well-known for nitrogen fixation in legumes, but it does not play a significant role in rice cultivation.
Conclusion
In conclusion, Azospirillum's ability to thrive in paddy fields and its beneficial effects on rice plants make it the common nitrogen-fixer in these agricultural systems.
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The common nitrogen-fixer in paddy fields is _________.a)Oscillatoriab)Frankiac)Rhizobiumd)AzospirillumCorrect answer is option 'D'. Can you explain this answer?
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