There is no exact number. The reason behind this is each year there is always new hybrid trees being grown.
Carrots are not hybrids by nature; they are a naturally grown vegetable that has been cultivated over thousands of years through selective breeding to reach the varieties we see today. Hybrid varieties of carrots may exist, but the standard orange carrot is not considered a hybrid.
Heirloom varieties of vegetables are varieties that were grown in the past which have not been grown for some time.
No, sweet corn varieties were first grown by Native Americans. Now a days most of these varieties have been lost and hybrid varieties are the most common. You can still find older varieties at places like Seed Savers and Johnny's Selected Seeds. Country Gentleman and Stowell's Evergreen are two of the more common, though others are available, particularly from "heirloom" seed houses.GMO, or genetically-modified organism, corn is not available to the home gardener due to the proprietary legal requirements attached to the use of the seed.
There are a wide variety of crops grown in Kentucky. These include corn, grains, soybeans, tobacco, as well as hay.
Apples
Several varieties of Bryophyllum are grown from buds produced at the leaf margins.
pine, oak, rhododendron, poplar, walnut, and larch
yes there are different varieties of kale. kale is a form of cabbage and one of the oldest varieties that was first grown in Mediterranean and was popular for centuries throughout Europe.
Opium poppies can technically be grown in Kentucky; however, it is illegal to cultivate them for the purpose of producing opiates. The cultivation of opium poppies is regulated under both state and federal laws, with strict penalties for illegal production. While certain varieties of poppies are allowed for ornamental purposes, growing them for opium production is prohibited. Always check local regulations before considering cultivation.
tobacco
more then 90% of all vegtables
99 percent of US corn is grown from hybrid seed, but not sure about world crops.