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(a) C = trachea, D = alveolus
                      (b) C = larynx, D = trachea
                      (c) C = alveolus, D = larynx
                      (d) C = larynx, D = bronchus
               Q4     Lungs have large number of alveoli for ________.

                      (a) More nerve supply.
                      (b) Having proper shape.
                      (c) More space for increasing volume of inspired air.
                      (d) More surface area for the diffusion of gases.
               Q5     Carefully observe picture given below and identify the part that contains
                      the alveoli?















                      (a) A
                      (b) B
                      (c) C
                      (d) D
               Q6     Bronchus divides further to form narrow and numerous tubes in lungs,
                      which are called ______.

                      (a) Bronchus
                      (b) Bronchioles
                      (c) Alveoli
                      (d) None of these
               Q7   Which of the following forms the floor of the chest cavity?

                      (a) Lungs
                      (b) Membrane


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