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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Rain is called acid rain when its pH is below
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Correct option: D
5.6
Option D (5.6) is correct because rain is defined as acid rain when its pH falls below 5.6.
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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