A seed is an umbilical embryo enclosed in a hard protective outer shell. The complete development of the seed, from the time of hatching until the time of plump growth is part of the reproductive process in seed plants, including the true seed and the hypoblast plant. In most cases, a full bloom in seed culture depends on the type of flower grown. Most perennial flower gardens have annual seeds rather than annuals, which have a small dormant period between blooming and dormancy.
When you look at a seed, you will see that it consists of a round structure with the nucleus at its center. This nucleus, which may be colored or white, is surrounded by a sheath of cystine encasing it. The rest of the seed, which contains all the other parts necessary for its proper growth is called the ovule. The ovule is the living part of a zygote, the small, egg-shaped structure that produces the seed. The ovule and zygote are actually one embryo, but the term is used to describe the stage of development between the egg and zygote.
Flowering plants divide so that the growing tips of the plants can attain the height and maturity needed for pollination. The endosperm, or male part of a flower, grows first and then the seeds are dispersed throughout the plant. The endsperm eventually dies out and the seeds become part of the ovule, which is the living part. As seedlings mature, the endosperm is removed and the seeds are re-absorbed into the bulb or stem.
Flowering plants have two kinds of seed coat. The cut seed coat is made up of a thin membrane of an oily protein, whereas the pollen coat is made up of a seed coat made up of a starch protein. The Ovary Egg has a coat of an oily protein, while the Endosperm has a thin layer of a starch protein. The thickness of the seed coat determines the chances of the seed surviving after it is disseminated throughout the plant.
The life cycle of a seed starts from the ovulation period, in which an egg is released from an ovary. The fertilized egg is contained in the ovary for about twenty-four hours before it starts its journey to the Fallopian tube. If fertilization occurs in the Fallopian tube, the result is a live seed. If fertilization does not occur in the tube, the result is a dead seed. Dead seeds will not grow.
After the twenty-four hour period the ovule is released from the ovary and travels towards the seed chamber. There, the remaining seed coats are dispersed into the environment. Some seeds will be successful and grow; others will be dead. The ones that are not successful travel back to the ovule where they are dispersed into the environment. A process called displacement occurs: the eggs in the lower chamber are displaced into the upper chamber, while the successful seeds are scattered out of the ovulum.
Once the ovule reaches the correct place, the procedure begins to shift the nuclei around. The nucleus of the embryo grows on the scaffold, while the nuclei of the other elements grow on the ovule. When all the necessary elements have been evenly distributed, the zygote is ready to form. Nuclei can move into position in different ways.
The process of dispersing the seed coat requires patience. The endosperm grows faster than the other nuclei; therefore it is often dispersed first. However, if too many endosperm cells surround the zygote, this can prevent it from growing properly. The polar nuclei are more likely to move and help form the correct shape of the zygote.