Biological control of some soil-borne plant diseases has been achieved through the use of __________.

Rhizobacteria

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Streptomyces

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Nostoc

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Micrococcus

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Solution

The correct option is A Rhizobacteria
Plant growth-promoting rhizobacteria (PGPR) are indigenous to soil and the plant rhizosphere and play a major role in the biocontrol of plant pathogens. PGPR can profoundly improve seed germination, root development and water utilization by plants.PGPR can also protect against viral diseases.
So, the correct answer is (A)

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