something made of cellulose- an organic compound with the formula N.

 something made of chitin-its a characteristic component of the cells walls of fungi, the exoskeletons of arthropods such as crustaceans(e.g. crabs, lobsters and shrimps) and insects, the radulae of mollusks, and the beaks and internal shells of cephalopods.

 A dicot leaf-were one of the two groups into which all the flowering plants or angiosperms were formerly divided

 Growth ring- concentric layer of wood, shell, or bone developed during an annual or other regular period of growth