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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Drinking of mineral water with very low level of pesticides (about 0.02 ppm) for long periods may
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Correct option: D
Lead to accumulation of pesticide residues in body fat
Option D is correct because pesticides, being fat-soluble, tend to accumulate in body fat over time, especially with continuous exposure.
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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
(ii) The area was sprayed with DDT by an aircraft
(iii) The lake water turned green and stinky
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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