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Which feature of some species of blue-green algae helps promote them as bio-fertilizers?
they convert atmospheric methane into ammonia which the crop plants can absorb
They 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 the crop plants can absorb readily
They induce the roots of the crop plants to absorb the soil nitrates in large quantities.
3rd option is correct. Blue- Green algae have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily which helps to promote them as bio-fertilizers.
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