Which of the following statements is correct?

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(B) The correct statement is $B$. $1$. Excessive use of chemical fertilizers leads to nutrient runoff into nearby water bodies,causing eutrophication,

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Excessive use of chemical fertilizers leads to eutrophication in nearby water bodies.

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(B) The correct statement is $B$. $1$. Excessive use of chemical fertilizers leads to nutrient runoff into nearby water bodies,causing eutrophication,which results in algal blooms and oxygen depletion. $2$. Option $A$ is incorrect because maize can be grown organically. $3$. Option $C$ is incorrect because while both are nitrogen fixers,$Azotobacter$ is a free-living bacterium,whereas $Rhizobium$ forms symbiotic associations in root nodules. $4$. Option $D$ is incorrect because $Anabaena$ and $Nostoc$ are primarily nitrogen fixers,not phosphate or potassium mobilizers.

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