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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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If a pond food chain gets polluted by DDT, the tissue concentration of DDT would be highest in
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Correct option: D
Bird feeding on fish
Option D (Bird feeding on fish) is correct because DDT biomagnifies up the food chain, resulting in the highest concentration in top predators like birds that consume fish.
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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