2. Sample Papers
  3. SSC
  4. Ecology And Environment

SSC Ecology And Environment Sample Paper NCERT Sample Paper-1

  • question_answer
    Sewage water can be purified for recycling with the action of

    A) Fishes   

    B) penicillin

    C) Aquatic plant

    D) micro-organisms

    Correct Answer: D

    Solution :

    Sewage water remains oxygen deficient. If sufficient algal growth is allowed in the sewage, due to rapid photosynthetic activity, the amount of oxygen increases which is used by micro-organism for the decomposition process.


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