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(A) Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments,many of which can fix atmospheric nitrogen. In p

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Cyanobacteria

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(A) Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments,many of which can fix atmospheric nitrogen. In paddy fields,cyanobacteria such as $Anabaena$ and $Nostoc$ serve as an important biofertilizer. They not only add nitrogen to the soil but also add organic matter,which increases the fertility and productivity of the paddy crop by up to $50\%$. Therefore,the correct option is $A$.

Modern farmers can increase the productivity of paddy by up to $50\%$ using . . . . . . .

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