Which of the following is a pair of biofertilizer?

Which of the following is a pair of biofertilizer?

Options

(a) Nostoc and legume
(b) Rhizobium and grasses
(c) Azolla and blue green algae
(d) Salmonella and Escherichia coli

Correct Answer:

Azolla and blue green algae

Explanation:

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