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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Which one of the following is the heavy toxic metal present in waste water from industries?
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Correct option: A
Mercury
Option A (Mercury) is correct because mercury is a well-known heavy toxic metal commonly found in industrial wastewater.
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(i) Lost of urea and phosphate fertilizer were used in the crops in the vicinity
(ii) The area was sprayed with DDT by an aircraft
(iii) The lake water turned green and stinky
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. Which of the following is not used for disinfection of drinking water? World most problematic aquatic weed is