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Which of the following is not used to clear-out heavy metals contaminated environment?

(a) Bacteria

(b) Fungi

(c) Algae

(d) H2S

I have been asked this question during an interview for a job.

This question is from Microbial Applications for Metal Removal in chapter Microbial Transformation of Heavy Metals of Environmental Biotechnology

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Correct answer is (d) H2S

Easiest explanation: H2S is mostly used in wastewater treatment plants but it is not used to clear-out heavy metals contamination from the environment. Whereas, microorganisms like fungi, bacteria and algae are used to clear-out heavy metals contaminated environment and this occurs by bioaccumulation process.

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