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Angiosperms-During reproduction of flowering plants first spores are produced with half the number of chromosomes in their cell nuclei. The male spores lead to the formation of pollen grains in which the sperm cells arise. After fertilization a young embryo with again the same number of chromosomes as the parental plants develops in the ovule (more on fertilization in Angiosperms).                                                                                                                                                                                           GymnospermsMale and female cones develop on the mature sporophyte (the tree). Meiosis in the ovules of the female cones leads to the formation of female gametophytes, the embryo sacs containing each one egg. The male cone consists of scale that carry each a pollen sac in which pollen grains are produces through meiotic division. After bursting of the pollen sacs pollen grains are dispersed and can reach the female cone through the air. There a pollen tube can grow in which the sperm cells migrate tot the egg cell, ending in fertilization. An embryo is thus formed that ususally needs several years to develop into a complete seed that once on the soil will be able to germinate and to grow to a new sporophyte.         
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