A seed is basically an unformed aquatic plant enclosed in an outer protective cover. The process of germination of a seed is a critical part of the development of a seedling, which in the case of seeds is in the case of plants, the fungi, such as the chyngnuicum and the Alternaria, to name a few. The inner core of the shell is composed of a prothallium. Seeds are enclosed in the coiled structure of a seed cell and contain chlorophyll, which is a green colored pigment that is responsible for the photosynthesis of carbohydrates by the plant. Chlorophyll is also responsible for the absorption of carbon dioxide from the atmosphere, and in the process receives oxygen it needs to function properly.
Seeds are produced by the species Schizosaccharomyces pombe. The exact process and time depend on the species, and seeds may be produced over a few days or more, or even decades. When seeds are sown, they are covered with a thin layer of skin called the seed coat, which protects the seeds from damage. The seed coat is shed once the plant starts growing.
To start growing seeds, a piece of tissue called a somary epithelium is removed from the root end of the plant and replaced on an egg cell. In most species, this step is done at the beginning of spring, although in some seed saving plants, the ovary epithelium is sometimes removed before the seeds are planted. The procedure of removing the epithelium from the root tip and replacing it on an egg cell will in most cases result in a complete seed loss.
Embryos are formed in the laboratory from a variety of different species, and seeds are often collected and stored in special glass jars. It takes millions of years for the germ to germinate and begin to grow, but once it is, the germ can survive for millions of years. For some species, this can mean hundreds of years. Seed saving works by preserving these long-term seeds so they can be sown later, rather than lost. If a species is rare, the costs of preservation may be high, but seed companies use a wide range of approaches to reduce the cost.
Seed production does not happen in nature. Birds and mammals produce seeds, but these seeds are usually sterile and survive only a very short time. worms do not germinate nor do algae. Germination, however, is possible in the lab because all living organisms grow according to a set of rules. These rules provide the basis for the natural process of dormancy.
Dormancy is the process by which seeds decay after being in the Earth for a period of time. The first cells to die out are the ones that contain the highest quality seeds. These seeds are the best for making the next generation of plants, even though they are unlikely to germinate and grow. As a result, these seeds stay dormant for a longer period of time until there is a change to their environment. It may be rainfall, a change in soil, or exposure to sunlight. When this change occurs, the seeds once contained within the embryo are able to germinate and grow.
Seeds are exposed to light, either directly, by falling to the earth or indirectly, as when they are exposed to wind. Direct sunlight stimulates germination, but indirect sunlight, such as that from a window, also stimulates germination. There are also chemicals that cause the outer coating of seeds to peel off, exposing the inside of the seed coat, which also promotes growth. This outer coat protects the seed from various germinating insects.
Most seed plants are gymnosperms. However, a few belong to other plant families, including fungi. Almost all seed plants belong to the class of pterophytes, which includes nearly two hundred different species. Most seeds produced by gymnosperms are sown again within a few days to a week. Some seeds, such as those that contain sugar, can be stored for some time.