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प्रश्न
Which biofertilizer system is particularly significant for rice cultivation in paddy fields?
पर्याय
Legume–Rhizobium symbiosis exclusively
Azolla–Anabaena symbiosis and cyanobacteria
Frankia associations with legumes
Phosphate-solubilizing bacteria alone
MCQ
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उत्तर
The Azolla–Anabaena symbiosis and cyanobacteria are widely used in paddy fields because they significantly increase rice yield. Anabaena, a nitrogen-fixing cyanobacterium, lives in association with the water fern Azolla, and this combination enriches paddy field soil with biologically fixed nitrogen, making it ideal for rice cultivation.
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