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Which among the following is a process of bio remediation?

(a) Chemical Testing method

(b) Most probable number method

(c) Dissolved Oxygen method

(d) Immobilization

I have been asked this question in class test.

The query is from Introduction topic in portion Issues and Scope of Environmental Biotechnology of Environmental Biotechnology

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The correct answer is (d) Immobilization

The best I can explain: Immobilization of microbes is done for effective bio-remediation process, most probable number method is used to detect the presence of E. coli which is a fecal coliform bacterium, the chemical testing method detects the presence of ammonia, nitrate, pH or any chemical parameter, dissolved oxygen method measures the level of dissolved oxygen.

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