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Which of the following is a drawback of biological method of soil remediation?

(a) Contaminants may not be conducive

(b) Residual effects of human activities

(c) Biological contaminants

(d) Non-Biological contaminants

This question was posed to me in a national level competition.

Question is from Problem Soil Management & Remediation in division Management and Remediation of Problem Soil of Environmental Biotechnology

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Right option is (a) Contaminants may not be conducive

To explain I would say: Biological method of soil remediation is useful for a wide range of contaminants but some of them may not be removed, residual effects of human activities lead to environmental pollution, biological and non-biological contaminates are a part of environment.

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