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(c) Diaphragm
                      (d) Pleura
               Q8     Which of the following prevents the entry of food into the trachea?

                      (a) Epiglottis
                      (b) Hair
                      (c) Hard palate
                      (d) Soft palate
               Q9     In it are present lungs. It is surrounded on its sides by ribs and
                      diaphragm forms its floor. It is -

                      (a) Chest cavity
                      (b) Windpipe
                      (c) Lungs
                      (d) Stomach
               Q10  Which of the following organs is not a part of the human respiratory
                      system?

                      (a) Trachea
                      (b) Bronchus
                      (c) Alveolus
                      (d) Oesophagus



               SUBJECTIVE
                                                                                            Marks   Level

               Q1.  How is food prevented from entering the trachea when we eat                1        E
                      or drink?

               Q2.  Why do we often sneeze when we inhale a lot of dust–laden                  1        E
                      air?

               Q3.  List three features of alveoli which enable them to perform their          3        Av
                      function.
               Q4.  (a)  Explain the pathway of the entry of the air that we breathe           3        Av
                           in.
                      (b)  Name the organ which is present at the floor of the chest
                           cavity.
               Q5.  Explain the structure and function of the lungs                            3        D


               Q6.  (a) Draw a labelled diagram of human respiratory system.                   5        D
                      (b) What is the respiratory system made up of?





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