1. Incisors are used for _______ the food.   cutting   chewing   tearing   grinding   Hint Half-n-half Clue   2. Main function of molars and premolars is _______ the food.   grinding   cutting   circulating   tearing   Half-n-half Clue   3. _______ filter the blood to excrete harmful substances in the form of urine.   Kidneys   Lungs   Urinary bladder   Endocrine Glands   Half-n-half Clue   4. Epiglottis guards the opening of larynx into pharynx.   True   False   5. True or false: Exchange of air takes place in the lungs.   True   False   6. Which of the following helps in digestion? A. Pancreatic juice B. Saliva C. Bile D. All of these   A   B    C   D   Half-n-half Clue   7. 'C' shaped rings of cartilage are present in the   Trachea   Esophagus   Ureter   Intestines   Half-n-half Clue