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Which of the following can dissolve metals?

(a) Biogeochemcial cycle

(b) Microbial metabolic secretions

(c) Afforestation

(d) Deforestation

This question was addressed to me in homework.

This interesting question is from Microbes in Metal Containing Habitat topic in section Microbial Transformation of Heavy Metals of Environmental Biotechnology

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The correct answer is (b) Microbial metabolic secretions

To explain I would say: Microbial metabolic secretions are the one which can dissolve the heavy metals present in the soil by secreting a special type of enzyme or any organic acid like low molecular weight. Whereas, biogeochemical cycle is crucial for methanogens, the natural release of biogas in the environment is due to the activity of methanogens, hence, it can’t dissolve metals. Also, afforestation and deforestation cannot dissolve metals.

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