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To most of us, a fruit is a plant part that is eaten as a dessert or snack because it is sweet, but to a botanist a fruit is a mature ovary of a plant, and as such it may or may not taste sweet. All species of flowering plants produce fruits that contain seeds. A peach, for example, contains a pit that can grow into a new peach tree, while the seeds known as peas can grow into another pea vine. To a botanist, apples, peaches, peppers, tomatoes, pea pods, cucumbers, and winged maple seeds are all fruits. A vegetable is simply part of a plant that is grown primarily for food. Thus, the leaf of spinach, the root of a carrot, the flower of broccoli, and the stalk of celery are all vegetables. In everyday, nonscientific speech we make the distinction between sweet plant parts (fruits) and nonsweet plant parts (vegetables). This is why we speak of peppers and cucumbers and squash—all fruits in the eyes of a botanist—as vegetables.