Question:
Which one is used as biofertilizer in paddy fields?
Which one is used as biofertilizer in paddy fields?
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Blue-green algae are widely used as biofertilizers in rice cultivation.
Updated On: Mar 6, 2026
- Nostoc
- Chlorella
- Azotobacter
- Rhizobium
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The Correct Option is A
Solution and Explanation
Step 1: Understanding biofertilizers.
Biofertilizers are living organisms that enrich soil fertility by fixing atmospheric nitrogen.
Step 2: Role of Nostoc.
Nostoc is a cyanobacterium capable of fixing atmospheric nitrogen in flooded paddy fields.
Step 3: Comparison with other options.
Chlorella is an alga used as food supplement.
Azotobacter and Rhizobium are used mainly in dry fields and leguminous crops respectively.
Step 4: Conclusion.
Thus, Nostoc is used as a biofertilizer in paddy fields.
Biofertilizers are living organisms that enrich soil fertility by fixing atmospheric nitrogen.
Step 2: Role of Nostoc.
Nostoc is a cyanobacterium capable of fixing atmospheric nitrogen in flooded paddy fields.
Step 3: Comparison with other options.
Chlorella is an alga used as food supplement.
Azotobacter and Rhizobium are used mainly in dry fields and leguminous crops respectively.
Step 4: Conclusion.
Thus, Nostoc is used as a biofertilizer in paddy fields.
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