Kelly, Ph.D., is Vice President for Science Administration and Susan E. Lynch Director of Graduate Studies at The brand new York Botanical Garden. Cecilia Zumajo is a graduate pupil in the Botanical Gardenâ€™s Pfizer Plant Research Laboratory. When you follow Plant Talk or in case you noticed Ceciliaâ€™s paper on fruits, you know that fruits are the mature ripened ovaries of flowers. Many products generally regarded as vegetables-reminiscent of cucumbers, bell peppers, eggplants, tomatoes, and green beans-are in fact fruits. Fruits enclose and protect seeds. So what is a seed? The seed is the embryonic stage of the plant life cycle. Most seeds include three parts: embryo, endosperm, and seed coat. The embryo is a tiny plant that has a root, a stem, and a number of leaves. The endosperm is the nutritive tissue of the seed, often a combination of starch, oil, and protein. The seed coat is a protecting overlaying that may help seeds remain viable for long periods of time.