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7th Class Science Respiration in Organisms Question Bank Respiration In Plants And Animals

  • question_answer
    DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 4 Lungs are present in chest cavity. This cavity is surrounded by ribs on the sides. A large muscular sheet called diaphragm form the floor of the chest cavity. Percentage of oxygen in inhaled air is ____ in exhaled air.

    A) less than          

    B) more than

    C) same as         

    D) cannot say

    Correct Answer: B

    Solution :

    In inhaled air percentage of oxygen is 21 % as compared to 0.04 % in exhaled air.


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