NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES

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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
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

View answer and explanation

Correct option: A

(i) and (iii)

Option A ((i) and (iii)) is correct because fertilizer runoff and green, stinky water are indicative of eutrophication leading to fish mortality.

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Supreme court of India has ordered the Delhi government to take measures to improve the quality of air. The government started to use _________________ in public fleet. The unfavorable alteration of environment due to human activities is termed as The polluting strength of sewage is usually characterized by its Which of the following is not used for disinfection of drinking water? World most problematic aquatic weed is Assertion: Water pollutants are measured by BOD.

Reason: If BOD is more, the water is polluted.