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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of planktonic (free floating) algae which can accelerate which of the following phenomenon?
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Correct option: D
Both (1) and (3)
Option D (Both (1) and (3)) is correct because nutrient enrichment leads to algal blooms and eutrophication.
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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