Which of the following is the pair of biofertilizers?

Azolla and BGA

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Nostoc and legume

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Rhizobium and grasses

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Salmonella and E. coli

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Solution

The correct option is A Azolla and BGA
Biofertilizers are the suspension of microorganism which mainly increases the growth of the plants. These secrete the growth promoting substances. The microorganisms in bio-fertilizers restore the soil's natural nutrient cycle and build soil organic matter. Bio-fertilizers such as Rhizobium, Azotobacter, Azospirilium and blue-green algae (BGA) are used. Anabaena in association with water fern Azolla contributes nitrogen up to 60 kg/ha/season and also enriches soils with organic matter.
So, the correct answer is option A.

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