Discussion
Which are the sources for Selenium contamination in India among the following?
(i) Industrial sources
(ii) Agricultural Practices
(iii) Ground water
Answer: A
The sources are (i) and (ii), so the answer is Only (i) and (ii).
Selenium contamination comes from industrial sources such as coal combustion and fly ash, mining and metal processing, and from agricultural practices such as the use of phosphate fertilisers and irrigation that mobilises selenium from seleniferous soils, as seen in parts of Punjab.
Groundwater, in the key's reading, is the medium that carries selenium into crops and drinking water rather than a source of it; the selenium in it comes from the rocks, soils and human activities above. That rules out the options naming groundwater, alone or with other items.
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