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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
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Algal blooms imparts a distinct colour to water due to
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Correct option: A
Their pigments
Option A is correct because algal blooms impart color to water due to the presence of various pigments within the algal cells.
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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.
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(ii) The area was sprayed with DDT by an aircraft
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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