Which of the following is not a major source | vedclass

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(C) Biofertilizers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilizers are bacteria,fungi,and cyanobacteria

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Protozoa

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(C) Biofertilizers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilizers are bacteria,fungi,and cyanobacteria.$1$. Bacteria: Examples include $Rhizobium$,$Azospirillum$,and $Azotobacter$,which fix atmospheric nitrogen.$2$. Fungi: Mycorrhiza (e.g.,$Glomus$) absorbs phosphorus from the soil and passes it to the plant.$3$. Cyanobacteria: Examples include $Anabaena$,$Nostoc$,and $Oscillatoria$,which are autotrophic microbes that fix atmospheric nitrogen,especially in paddy fields.Protozoa are generally heterotrophic organisms that feed on bacteria and organic matter; they do not act as biofertilizers in agricultural practices. Therefore,the correct answer is $C$.

Which of the following is not a major source of biofertilizers?

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