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Which of the following population cannot be affected by heavy metals?

(a) Cyanobacteria

(b) Algae

(c) Protozoan

(d) Phytoremediation

I had been asked this question at a job interview.

I want to ask this question from Microbes in Metal Containing Habitat topic in chapter Microbial Transformation of Heavy Metals of Environmental Biotechnology

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Correct option is (d) Phytoremediation

To elaborate: Phytoremediation is a technique not a population, also, used to degrade heavy metals in the environment using plants, so, they are definitely not affected by heavy metals that would lead to their reduction in the environment. Whereas, cyanobacteria, algae and protozoan are found to be affected by heavy metals in the environment.

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