The fruit derived from ovary of a flower not associated wid any non - carpellary part is called true fruit. Whereas the fruit derived from the ovary along with other accessory floral parts is called a false fruit.
Apple is called false fruit bcoz the main edible part is the fleshy receptacle.
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Apple is Called False Fruit. False fruit are derived from mature ovary of a single flower accompanied by other parts of the same flower which on ripening become usually swollen and fleshy.