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SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    When fishes are kept in an aquarium containing water but no aquatic plants, they frequently come to the surface and float in a semi vertical position for want of:

    A)  Air                              

    B)  Oxygen

    C)  Dissolved oxygen

    D)         Fresh supply of oxygen

    Correct Answer: C

    Solution :

    [c] Oxygen is as critical to-fish life as it is to human life. Dissolved Oxygen refers to the oxygen gas that is dissolved in water. Fish absorb the Dissolved Oxygen directly from the water into their bloodstream through their gills. Although some species, such as bettas and gouramis, are capable of breathing air, sufficient oxygen levels should always be maintained in the water for all fish.


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