1. These are formed by division of trachea.   5   6   3   9   Hint Half-n-half Clue   2. It pumps blood to various parts of the body.   8   5   1   6   Half-n-half Clue   3. Exchange of gases occurs here.   8   2   7   3   Half-n-half Clue   4. Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   1   7   8   3   Half-n-half Clue   5. It is a muscular tube containing semicircular rings of cartilages.   2   7   5   1   Half-n-half Clue   6. Food descends from mouth to stomach through this muscular tube.   9   2   7   8   Half-n-half Clue   7. Food is mixed with saliva here.   3   9   1   2   Half-n-half Clue   FREE PREVIEW: Last 7 Questions not a part of the free preview. Get Premium Membership to view all questions.