Pine, an evergreen tree of great economic importance. Pines are conifers (cone-bearing trees) related to firs, cedars, larches, hemlocks, and araucarias. Pines make up the genus Pinus of the family Pinaceae. There are more than 90 recognized species, all native to the Northern Hemisphere. Most pines are found in areas with a temperate climate, but a few grow in mountainous tropical regions. About 30 species are native to the United States.
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.