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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Biochemical Oxygen Demand (BOD) in a river water
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Correct option: D
Increase when sewage gets mixed with river water
Option D (Increase when sewage gets mixed with river water) is correct because sewage contains organic matter that increases the demand for oxygen by microorganisms.
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A lake near a village suffered heavy mortality of fishes with in a few days. Consider the following reasons for this.
(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
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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