1. True or False: Trachea contains 16-20 'C'-shaped cartilaginous rings.   True   False   2. True or False: Breathing through the mouth is considered as good as breathing through the nose.   True   False   3. Identify bronchus in this diagram.   A   B   C   D   Hint Half-n-half Clue   4. Spirometer measures: A. Capacity of lungs B. Volume of air inhaled and exhaled C. Residual air D. All of these   A   B   C   D   Half-n-half Clue   5. Which cells of the blood carry oxygen to different parts of the body?   B   Larynx   False   Red blood cells   Half-n-half Clue   6. What is the leaf-like structure which prevents the entry of food into respiratory passages?   Larynx   Tongue   Epiglottis   Pharynx   Half-n-half Clue   7. True or False: Two-layered membrane which covers the lungs is known as pericardium.   True   False