. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. MEIOTIC PHASE IN PLANTS 213 At fertilization the two male gamete nuclei which are formed in each pollen grain are both introduced into the embryo-sac ; one fuses with the ovum nucleus to produce the zygote, while the other fuses with the central fusion nucleus, forming thus a triploid nucleus. This afterwards gives rise to the endosperm, or reserve food material of the seed. For a more detailed account of the gametophyte and fertilization in the flowering plants the reader is referred to any comprehensive work on bota

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. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. MEIOTIC PHASE IN PLANTS 213 At fertilization the two male gamete nuclei which are formed in each pollen grain are both introduced into the embryo-sac ; one fuses with the ovum nucleus to produce the zygote, while the other fuses with the central fusion nucleus, forming thus a triploid nucleus. This afterwards gives rise to the endosperm, or reserve food material of the seed. For a more detailed account of the gametophyte and fertilization in the flowering plants the reader is referred to any comprehensive work on bota

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