1. Exchange of air occurs in _______ which are also known as 'air sacs'.   Alveoli   Bronchioles   Bronchi   Alveolar ducts   Hint Half-n-half Clue   2. True or False: Two-layered membrane which covers the lungs is known as pericardium.   True   False   3. Normal rate of respiration in an adult human being is _______ times/ minute. A. 10-12 B. 12-14 C. 16-18 D. 22-24   A   B   C   D   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. What is the leaf-like structure which prevents the entry of food into respiratory passages?   Larynx   Tongue   Pharynx   Epiglottis   Half-n-half Clue   6. Identify bronchus in this diagram.   A   B   C   D   Half-n-half Clue   7. Identify diaphragm in this diagram.   B   C   D   E   Half-n-half Clue