Which of the following is used as biofertilis | vedclass

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(B) Biofertilisers are organisms that enrich the nutrient quality of the soil. $I.$ Cyanobacteria (blue-green algae) like $Nostoc$ and $Anabaena$ are

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$I, III$ and $IV$

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(B) Biofertilisers are organisms that enrich the nutrient quality of the soil. $I.$ Cyanobacteria (blue-green algae) like $Nostoc$ and $Anabaena$ are widely used as biofertilisers,especially in paddy fields,as they fix atmospheric nitrogen.$II.$ Yeast is a fungus used in fermentation processes (e.g.,brewing and baking) but is not a biofertiliser.$III.$ Symbiotic bacteria like $Rhizobium$ live in the root nodules of leguminous plants and fix atmospheric nitrogen.$IV.$ Free-living bacteria like $Azospirillum$ and $Azotobacter$ live in the soil and fix atmospheric nitrogen,thereby enriching the soil with nitrogenous compounds.Therefore,$I, III,$ and $IV$ are used as biofertilisers.

Which of the following is used as biofertiliser?
$I.$ Cyanobacteria
$II.$ Yeast
$III.$ Symbiotic bacteria
$IV.$ Free living bacteria
Choose the correct option.

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Which of the following is used as biofertiliser?$I.$ Cyanobacteria$II.$ Yeast$III.$ Symbiotic bacteria$IV.$ Free living bacteriaChoose the correct option.