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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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The polluting strength of sewage is usually characterized by its
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Correct option: C
BOD
Option C (BOD) is correct because Biochemical Oxygen Demand (BOD) is a measure of the organic matter in sewage, indicating its polluting strength.
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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
(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 Assertion: Water pollutants are measured by BOD.
Reason: If BOD is more, the water is polluted.
(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 Assertion: Water pollutants are measured by BOD.
Reason: If BOD is more, the water is polluted.