Gum Tree, any tree that yields a sticky substance known as gum. The sour gum, also called tupelo, is common in the eastern United States. Other North American gum trees include the sweet gum and the eucalyptus, which was introduced into California from Australia. The sapodilla tree of southern Mexico and Central America is the source of a gum called chicle, which is used as the base for many types of chewing gum.
Cucumber, a trailing vine of the gourd family. Its green fruit -- usually long and warty with crisp, white flesh -- is sliced and eaten raw in salads, or pickled with dill or other spices and eaten as a relish.
As Earth's population continues to rise, wheat plays an increasingly essential role in making sure everyone gets enough to eat. You can find cultivated wheat fields and dishes across the globe. It's time to put your wheat knowledge to the test.