Both the endosperm and the embryo are products of double fertilization, while the seed layer develops from maternal ovular tissues. A seed can be defined as the reproductive structure of a plant. The structure of a seed contains different parts that are used for various purposes. In fact, a seed is a mature fertilized egg.
It has an embryonic plant covered with a protective layer. There may be some differences in the shape, size, color, or surface of the seed, but they occur along the same plane. A seed is a structure that encloses the embryo of a plant in a protective outer cover. Under favorable growth conditions, a seed gives rise to a new plant, using the nutrients stored in it.
Cecilia and her co-authors found that even though gymnosperms have a comparatively simple egg and seed structure relative to angiosperms, they have more copies of the genes that control egg and seed development. In the typical flowering plant, or angiosperm, seeds form from bodies called eggs contained in the ovary, or basal part of the structure of the female plant, the pistil.