Seed
The Amazon jungles, mangroves, virgin forests, tropical forests and even plants in a kitchen garden have all originated from seeds. Many plants have survived over the ages through wind dispersals and alternative forms of reproduction. However, the predominance of gymnosperm and angiosperm plants in all landscapes confirms the importance of a seed.
A ripened ovule of a gymnosperm or angiosperm is called a seed. An angiosperm or a flowering plant has a seed enclosed in the ovary that later forms a fruit. Gymnosperm, conifer and related plants seeds lie open to the elements. A seed contains an embryo, which facilitates growth of a new plant under favorable circumstances. It also has a supply of accumulated food and is wrapped in a seed coat. This stored food is initially a tissue called endosperm derived from the parent plant. Over time, the endosperm becomes rich in oil starch and protein. In some species, the embryo is embedded in the endosperm, which will be used later by the sapling, upon germination. In some other species, the embryo absorbs it as it grows within the developing seed. (more…)
