front 1 Anther | back 1 In an angiosperm, the terminal pollen sac of a stamen, where pollen grains containing sperm-producing male gametophytes form. |
front 2 Basal Angiosperm | back 2 A member of one of three clades of early-diverging lineages of flowering plants. Examples are Amborella, water lilies, and star anise and its relatives. |
front 3 Carpels | back 3 The ovule-producing reproductive organ of a flower, consisting of the stigma, style, and ovary. |
front 4 Double Fertilization | back 4 A mechanism of fertilization in angiosperms in which two sperm cells unite with two cells in the female gametophyte (embryo sac) to form the zygote and endosperm. |
front 5 Embryo Sac | back 5 The female gametophyte of angiosperms, formed from the growth and division of the megaspore into a multicellular structure that typically has eight haploid nuclei. |
front 6 Endosperm | back 6 In angiosperms, a nutrient-rich tissue formed by the union of a sperm with two polar nuclei during double fertilization. The endosperm provides nourishment to the developing embryo in angiosperm seeds. |
front 7 Fruit | back 7 A mature ovary of a flower. The fruit protects dormant seeds and often aids in their dispersal. |
front 8 Integument | back 8 Layer of sporophyte tissue that contributes to the structure of an ovule of a seed plant. |
front 9 Magnoliid | back 9 Member of the angiosperm clade that is most closely related to the combined eudicot and monocot clades. Extant examples are magnolias, laurels, and black pepper plants. |
front 10 Micropyle | back 10 A pore in the integuments of an ovule. |
front 11 Monocot | back 11 Member of a clade consisting of flowering plants that have one embryonic seed leaf, or cotyledon. |
front 12 Ovary | back 12 In flowers, the portion of a carpel in which the egg-containing ovules develop. |
front 13 Ovule | back 13 A structure that develops within the ovary of a seed plant and contains the female gametophyte. |
front 14 Petal | back 14 A modified leaf of a flowering plant. Petals are the often colorful parts of a flower that advertise it to insects and other pollinators. |
front 15 Pollen Grain | back 15 In seed plants, a structure consisting of the male gametophyte enclosed within a pollen wall. |
front 16 Pollination | back 16 The transfer of pollen to the part of a seed plant containing the ovules, a process required for fertilization. |
front 17 Sepals | back 17 A modified leaf in angiosperms that helps enclose and protect a flower bud before it opens. |
front 18 Stamen | back 18 The pollen-producing reproductive organ of a flower, consisting of an anther and a filament. |
front 19 Stigma | back 19 The sticky part of a flower's carpel, which receives pollen grains. |
front 20 Style | back 20 The stalk of a flower's carpel, with the ovary at the base and the stigma at the top. |