The term of “seed” has several different definitions. There is a great variety of different seeds: vegetable seeds, flower seeds, perennial seeds, herb seeds, heirloom seeds, organic seeds, chia seeds, plants seeds an so on. Even the beautiful selection of ProFlowers roses start off as seeds. First of all it is a small embryo plant covered with special coat which has a name of the seed coat. Secondly it is a ripened plant ovule that contains an embryo, a reproductive part of a plant.
One more definition of seeds comes from seeds as a group. It is the result of the insemination, after that come ovule of gymnosperm and angiosperm plants. Later a growth of the mother plant can be noticed. The seed training finalized the reproduction process in spermatic plants, thus the embryo comes from the zygote and the seed covering - from the teguments of the ovule.
Herbs grow from seeds & bulbs. Every seed contains a tiny plant which germinates at the right conditions; so to say it starts to grow. Seeds start germinating after three conditions are done: humidity, appropriate temperature (warmth), and good location (such as soil).
Seeds are an important evolution for the flower plants reproduction and diffusion, while more primitive plants (mosses and ferns) don’t use seeds and have other ways to reproduce themselves. This can be proved by the seed plants success that can be seen in their wide spread all over different landscapes, from forests to fields, in all kind of climates.
Seeds vary in size. The tiny orchid seeds are the smallest known seeds; there are more than a million seeds in one gram. The biggest size has coco de mer seed.
Seeds are multifunctional. The most important one is that seeds are a mean of reproduction. Generally seeds are the result of sexual reproduction which makes genetic material and phenotype material combine together under the influence on the natural selection.