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Fruit anatomy is the internal structure of fruits. Fruits are the mature ovary or ovaries of one or more flowers. In fleshy fruits, the outer layer (which is often edible) is the ''pericarp'', which is the tissue that develops from the ovary wall of the flower and surrounds the seeds. But in some seemingly pericarp fruits, the edible portion is not derived from the ovary. For example, in the fruit of the ackee tree the edible portion is an aril, and in the pineapple several tissues from the flower and stem are involved. The outer covering of a seed is tough because the parent plant needs to protect the plant growing. == Categories of fruits == Some plants commonly called vegetables, such as cucumbers, tomatoes, and squash, are actually fruits. Fruits are found in three main anatomical categories: * Simple fruits are formed from a single ovary and may contain one or many seeds. They can be either fleshy or dry. Berries and drupes are examples of simple fleshy fruits. Pomes are both accessory fruits and simple fruits. Nuts are dry fruits. * Aggregate fruits are formed from a single compound flower and contain many ovaries. Examples include raspberries and blackberries. * Multiple fruits are formed from the fused ovaries of multiple flowers. An example of a multiple fruit is pineapple. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fruit anatomy」の詳細全文を読む スポンサード リンク
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