So many preschoolers know the words -fruit and vegetable but how many can tell you the differences. This is a great topic and open for lots of discussion!
For openers ask them:
How Do You Know a Vegetable from a Fruit?
One way is fruits grow on trees or vines and vegetables grow in the ground.
Bring in some real foods and and see if they can tell you if it grows in the ground or on a tree and if it is a fruit or a vegetable.
Have such examples as corn, tomatoes, green beans, pears, peaches and grapes. Then have them all for a great healthy snack.
(Have some unusual ones much as kiwi,eggplant, orange bell peppers or any others you can find at your local store.