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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
1
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Foul smell in the water bodies of tanks, ponds ,etc, is due to
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Correct option: B
Anaerobiosis
Option B (Anaerobiosis) is correct because foul smells in water bodies are often due to anaerobic decomposition, which produces gases like hydrogen sulfide.
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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