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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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In an area where DDT had been used extensively, the population of birds declined significantly because
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Correct option: B
Many of the birds eggs laid, did not hatch
Option B (Many of the birds eggs laid, did not hatch) is correct because DDT accumulation leads to eggshell thinning, preventing successful hatching.
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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