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An Intiative by Sri Chaitanya
a
Both Azotobacter and Rhizobium fix atmospheric nitrogen in the root nodules of plants.
b
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil.
c
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies.
d
At present, it is not possible to grow maize without chemical fertilizers.
answer is C.
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