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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Without greenhouse effect the average temperature at surface of earth would have been:-
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Correct option: A
Option A (-18° C) is correct because without the greenhouse effect, the Earth's average surface temperature would be significantly lower, estimated to be around -18°C.
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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