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Which of the following is an example of extensive method?

(a) Soil washing

(b) Cropping of plants that accumulate heavy metals

(c) Global warming

(d) Carbonate equilibrium

I got this question by my college director while I was bunking the class.

My question comes from Problem Soil Management & Remediation topic in section Management and Remediation of Problem Soil of Environmental Biotechnology

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Correct choice is (b) Cropping of plants that accumulate heavy metals

For explanation I would say: Cropping of plants that accumulate heavy metals doesn’t consider speed as a neccesity, hence comes under extensive methods, Soil washing is a method of intensive technologies, global warming leads to increase in temperature, carbonate equilibrium controls atmospheric CO.

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