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Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilisers?

1. Aspergillus and Cyanobacteria
2. Aspergillus and Rhizopus
3. Rhizobium and Rhizopus
4. Cyanobacteria and Rhizobium

Correct answer: Cyanobacteria and Rhizobium

Solution

Rhizobium fixes atmospheric nitrogen in root nodules of legumes, and cyanobacteria also enrich soil by fixing nitrogen. The other listed fungi are generally not used as biofertilisers.

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