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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
1
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BOD is concerned with
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Correct option: C
Microbes and organic matter
Option C (Microbes and organic matter) is correct because BOD (Biochemical Oxygen Demand) measures the amount of oxygen consumed by microbes while decomposing organic matter in 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