Which feature of some species of blue green algae helps prom

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Which feature of some species of blue green algae helps promoted them as bio-fertilizers?

[UPSC CSE Prelims 2010]

They convert atmospheric methane into ammonia which the crop plants can absorb readily

The induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates

They have the mechanism to convert atmospheric nitrogen into a form that crop can absorb readily

The induce the roots of the crop plants to absorb the soil nitrates in larger quantities