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Which of the following is pair of bio-fertilizers?

1. Azolla and BGA
2. Nostoc and legumes
3. Rhizobium and grasses
4. Salmonella and E. coli

Correct answer: Azolla and BGA

Solution

Azolla is a nitrogen-fixing aquatic fern used as a biofertilizer, and BGA (blue-green algae/cyanobacteria) also fixes atmospheric nitrogen in paddy fields. The other options include a plant group, a nonmatching host, or non-biofertilizer bacteria.

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