1. It is a muscular tube containing semicircular rings of cartilages.   7   5   2   13   Hint Half-n-half Clue   2. It pumps blood to various parts of the body.   8   12   7   5   Half-n-half Clue   3. It secretes pancreatic juice.   11   16   1   13   Half-n-half Clue   4. These are formed by division of trachea.   5   8   6   12   Half-n-half Clue   5. It secretes saliva.   2   3   9   8   Half-n-half Clue   6. Exchange of gases occurs here.   6   7   2   5   Half-n-half Clue   7. Most of the ingested water is absorbed here.   6   14   7   3   Half-n-half Clue