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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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The atmosphere around earth is warmed because
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Correct option: B
Molecules in the atmosphere are warmed by radiation from earth and retain that heat
Option B (Molecules in the atmosphere are warmed by radiation from earth and retain that heat) is correct because greenhouse gases in the atmosphere absorb and re-emit infrared radiation from the Earth's surface, trapping heat and warming the planet.
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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