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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Initially BOD of primary effluent in aeration tank increases in STPs because
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Correct option: A
Vigorous growth of useful aerobic microbes occur
Option A (Vigorous growth of useful aerobic microbes occur) is correct because the initial increase in BOD in the aeration tank of STPs is due to the rapid growth of aerobic microbes consuming the organic matter.
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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