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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste water into natural surface water, is
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Correct option: B
< 10 ppm
Option B (< 10 ppm) is correct because the CPCB prescribes a BOD limit of less than 10 ppm for discharge into natural surface water.
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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