The seed structure consists of three main parts: the seed coat, the embryo, and the endosperm. The seed coat is the outer protective layer that shields the seed from damage and dehydration. The embryo is the young plant that will develop when the seed germinates, containing the future root and shoot. The endosperm provides the necessary nutrients to support the embryo's growth until it can produce its own food through photosynthesis. Seeds can vary in size, shape, and structure depending on the plant species. For example, sunflower seeds are flat and oval, while coconut seeds are large and hard. The diversity in seed structure helps plants adapt to different environments and ensures their survival and reproduction.