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7th Class Science Respiration in Organisms Question Bank Respiration in organisms

  • question_answer
    Analysis of a sample of air gives the following details.
    Nitrogen Oxygen Carbon dioxide
    78.0% 16.4% 4.4%
    From which of the following sources the sample of air is most probably taken

    A)  Dissolved air from pond water.

    B)  Fresh air from a field.

    C)  Exhaled air.

    D)  inhaled air.

    Correct Answer: C

    Solution :

    The percentage of oxygen and carbon dioxide in inhaled air is 21% and 0.04% respectively. During respiration, oxygen is used up by the cells producing carbon dioxide.


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