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Farmers have reported over 50% higher yields of rice by using the biofertilizer

1. Azolla pinnata
2. Cyanobacteria
3. Legume-Rhizobium symbiosis
4. Mycorrhiza

Correct answer: Cyanobacteria

Solution

Cyanobacteria are widely used as biofertilizers in rice paddies because they fix atmospheric nitrogen and enrich the flooded soil. This improves nutrient availability and can raise rice yields substantially.

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