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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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A lake affected by high levels of artificial eutrophication will have
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Correct option: A
High nutrient levels, large phytoplankton populations, and low oxygen levels at depth.
Option A (High nutrient levels, large phytoplankton populations, and low oxygen levels at depth) is correct because eutrophication leads to increased nutrients, algal blooms, and subsequent oxygen depletion as the algae decompose.
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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