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What is the significance of green image?

(a) Bio-magnification

(b) Soil remediation using biological method

(c) Soil remediation using chemical method

(d) lyophilization

The question was asked in an interview for job.

My question is taken from Problem Soil Management & Remediation topic in chapter Management and Remediation of Problem Soil of Environmental Biotechnology

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Right option is (b) Soil remediation using biological method

To explain: Soil remediation using biological method is non-toxic to the environment, hence, referred to as green image, soil- remediation using chemical method requires comparatively higher temperature and pressure and is not very environment friendly, lyophilization is a process of freeze drying, Bio-magnification is the process by which toxic substances get deposited in the food chain.

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