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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
1
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During day time, sound level is silent zone is
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Correct option: A
50 dB
Option A is correct because the permissible sound level during daytime in a silent zone is typically around 50 dB.
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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