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Biology - section - 2
  1. At the time of inspiration the diaphragm

    2. A.

     Expand
    B.

     Contract
    C.

     Relaxed
    D.

     Does not under any change

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  2. Rate of breathing in a minute by man is

    3. A.

     16-18
    B.

     20-25
    C.

     11-15
    D.

     70-72

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  3. The C shape of the tracheal cartilage is important because

    4. A.

     Divide the nasal cavity
    B.

     Allows for expansion or contraction of the trachea
    C.

     Provide a surface for the sense of smell
    D.

     All of the above

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  4. Alveoli is related to which of the following system of human body?

    5. A.

     Circulatory system
    B.

     Excretory system
    C.

     Reproductive system
    D.

     Respiratory system

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  5. Complete oxidation of sucrose in presence of oxygen into CO2, water and energy is called

    6. A.

     Aerobic respiration
    B.

     Anaerobic respiration
    C.

     Glycolysis
    D.

     Hydrolysis

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  6. When the diaphragm and external intercostal muscles contract,

    7. A.

     The volume of the thorax decreases
    B.

     The volume of the lungs decreases
    C.

     The volume of the thorax increases
    D.

     The lungs shrink

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  7. Blood leaving lungs, is rich in

    8. A.

     Oxygen
    B.

     Carbondioxide
    C.

     Haemoglobin
    D.

     Number of RBC

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  8. The organs protected by the thoracic cage include the

    9. A.

     Lungs
    B.

     Heart
    C.

     Both a & b
    D.

     None of the above

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  9. By complete oxidation of glucose number of ATP molecule formed is

    10. A.

     2
    B.

     28
    C.

     38
    D.

     48

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  10. If CO2 concentration in the blood increases, the breathing will

    11. A.

     Increase
    B.

     Decrease
    C.

     Stop
    D.

     No effect

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