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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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The amount of biodegradable organic matter in sewage water can be estimated by measuring
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Correct option: B
Biochemical oxygen demand
Option B (Biochemical oxygen demand) is correct because BOD specifically measures the amount of oxygen required by microorganisms to decompose biodegradable organic matter in water.
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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