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A fruit is the mature ovary of a seed plant, usually developed from a flower. Fruits have seeds so they further the reproductive cycle. A vegetable is a plant or that part of a plant which is edible, and does not necessarily have a role in the plant's reproductive cycle.
But if one were to be asked the difference between a fruit and a vegetable, he would be in a fix and can at best cite examples of each. It is therefore necessary to know the basis of classification of fruits and vegetables as well as their nutritional differences since they matter so much to us.