1. Food descends from mouth to stomach through this muscular tube.   7   10   1   9   Hint Half-n-half Clue   2. It is a muscular tube containing semicircular rings of cartilages.   3   10   5   12   Half-n-half Clue   3. Absorption of food occurs here.   2   5   15   6   Half-n-half Clue   4. It secretes saliva.   15   8   3   7   Half-n-half Clue   5. These are formed by division of trachea.   7   6   9   15   Half-n-half Clue   6. Food is mixed with saliva here.   2   12   7   14   Half-n-half Clue   7. Exchange of gases occurs here.   7   2   1   11   Half-n-half Clue