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| asexual reproduction suckers stolons rootstock scion sporophyte gametophyte callus protoplast fusion somatic hybrid flowers fruit whorl receptacle calyx sepals corolla petals androecium stamens anthers gynoecium carpels ovules ovary styles stigmas pistil monoecious dioecious megagametophytes microgametophytes megaspores microspores pollen sacs pollen grain generative cell tube (or vegetative) cell polar nuclei embryo sac pollination pollinators nectar triploid cell endosperm double fertilization diploid zygote triploid endosperm maternal tissue cotyledons radicle hypocotyls plumule coleoptile seed coat seed dormancy germinate ethylene senescence receptacle pericarp exocarp mesocarp endocarp drupe berry pome hypanthium dehiscent fruits indehiscent fruits germination imbibes imbibition hypocotyls radicle |