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Some heterotrophic bacteria are present in the copper dumps which indirectly affect metal ________ by affecting the growth and activity of metal solubilizing _______

(a) solubilization; bacteria

(b) solubilization; fungi

(c) activity; bacteria

(d) activity; fungi

I have been asked this question during an internship interview.

My question is taken from Metal Recovery by Bioleaching Process in portion Bioleaching and Biomining for Recovery of Resources of Environmental Biotechnology

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Right choice is (a) solubilization; bacteria

To explain: Some heterotrophic bacteria indirectly affect metal solubilization by affecting the growth and activity of metal solubilizing bacteria. Metal solubilization is one of the main factors of activity and growth and most of the leaching of copper includes strains of bacteria and not fungi.

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