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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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In India, Jhum cultivation is practiced mainly in
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Correct option: A
North eastern states of India
The correct answer is A (North eastern states of India) because Jhum cultivation is primarily practiced in the northeastern region of India.
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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