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6th Class Science The Living Organisms and their Surrounding Question Bank Our Environment

  • question_answer
    The gas X is only about 20 parts out of 10 parts of air in the atmosphere. It is needed for decomposition of organic matter. The  gas X is

    A)                     Carbon dioxide           

    B)        Water vapor    

    C)                    Oxygen           

    D)        Nitrogen.

    Correct Answer: C

    Solution :

    Air is a mixture of gases, mainly containing nitrogen (about 78% by volume) and oxygen (about 21%). Oxygen is needed for decomposition of organic matter.


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