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Seeds are the ovule of a plant that has been fertilized by pollen that can grow into a new plant. It has an outer coat that protects the seed. Inside it has the baby plant or plant embryo and food for its growth.
Seeds come in a variety of shapes and sizes and they take various amounts of time to grow into full fledged plants.
How do seeds get formed? The flower of a plant contains a carpel which has a the female pistil within. At the top of the pistil is a sticky pad called the stigma. This area catches the pollen either from this same flower, but more often from another flower. This happens as a result of insects flying from flower to flower, or by wind, water, birds, small mammals and by humans. This is the act of pollination. Later, when the pollen unites with the egg or ovule within the pistil, the process is called fertilization. Fertilization is different than pollination in that fertilization is the actual act of the pollen and egg uniting to form the new seed. Fertilization may also take place much later on than pollination.
Later after some time within the seed casing the period of germination takes place. Germination is process by which the plant embryo or baby plant within the seed grows and the baby seedling comes forth from the seed.