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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Which of the following is not used for disinfection of drinking water?
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Correct option: A
Phenyl
Option A (Phenyl) is correct because phenyl is an antiseptic and disinfectant used for surfaces, not for drinking water disinfection.
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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
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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. World most problematic aquatic weed is Assertion: Water pollutants are measured by BOD.
Reason: If BOD is more, the water is polluted.