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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Eutrophication is excessive growth of algae, plants and animals in water-bodies due to nutrient enrichment particularly with
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Correct option: A
Nitrogen and phosphorus
Option A (Nitrogen and phosphorus) is correct because eutrophication is primarily caused by excessive nitrogen and phosphorus.
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(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. Which of the following is not used for disinfection of drinking water? World most problematic aquatic weed is