SSC Ecology And Environment Sample Paper NCERT Sample Paper-5

  • question_answer
    A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this?
    [a] Lots of urea and phosphate fertilizer were used in the crops in the vicinity
    [b] The area was sprayed with DDT by an aircraft
    [c] The lake water turned green and stinky
    [d] Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake?

    A)  b, c     

    B)  c, d

    C)  a, c     

    D)  a, b

    Correct Answer: C

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