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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Eutrophication results in reduction of
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Correct option: B
Dissolved oxygen
Option B (Dissolved oxygen) is correct because eutrophication leads to excessive algal growth, which consumes dissolved oxygen and causes hypoxia or anoxia.
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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