the part of the flower stalk that bears the floral organs; located at the base of the flower
the lowermost or outermost whorls of structure, which are usually leaflike and protect the developing flower; the sepals collectively constitute the Calyx
whorls of structures located inside and usually above the sepals; may be large and pigmented(in insect=pollinated flowers) or inconspicuous(in wind-pollinated plants). the petals collectively
the male portion of the plant that rises above and inside the petals; consists of stamens, filament and anther, inside the anthers are pollen gains.
the female portion of the plant that rises above and inside the androecium; consists of one or more carpels, ovary, style, stigma ovary contains ovules that contain the megagametophyte/embryo sac and contains female gamest
regular flowers, tulips, radiate from the center of the flower.
irregular flowers, snapdragons, parts are different
produces haploid spores by meiosis then develops into the gametophyte by mitosis and cellular differentiation.
production of spores in the sporphyte by meiosis
production of gametes by gametophytes
production of microspores within microsporangia of a flower's anthers via meiosis of microspore mother cells (microsporocytes)
control growth of the pollen tube
replicate to produce two sperm nuclei
production of megaspores; it occurs in the sporangia of the flower ovary by meiosis of megaspore mother cells(megasporocyte)
megaspores develop into megagametopyets called ovule and have 2 integuments coverings
one sperm nucleus fuses with teh egg to form the diploid (2n) zygoate, and the other sperm fuses with the two polar nuclei to form a triploid (3n) nucleus. In angiosperms.
mature ovule that includes a seed coat, a food supply, and an embryo. ex)Capsella (a dicot)
stored nutrients of embryo's absorbed endosperm
zygote divides and left with basal cell, suspensor, and 2 celled proembryo.
column of cells that pushes the embryo into the endosperm.
bilateral symmetry of two cotyledons. root and shoot meristem appear.
cotyledons and root axis elongate . procambial tissue appears to develop into vascular tissue later.
has large bent cotyledons on sides of the stem apical meristem. radicle forms roots later, bypocotyl is between apical and radicle.
bean. small opening on the surface of the seed through which the pollen tube grew.
bean. an adjacent, elliptical area at which the ovule was attached to the ovary.
bean. food for the embryo
corn. cotyledon; this structure helps absorb the endosperm.
corn. sheath enclosing shoot apical meristem and leaf primordia of grass embryos
corn. sheath enclosing embryonic root of grass embryo
mature, ripened ovary plus any associated tissue.
outer wall of fruit composed of an exocarp, mesocarp, and endocarp
cones of gymnopserm
seeds plants like ferns, but unlike ferns they are heterosporous; produce two types of spores:mega and microspores. cycadophyta, ginkgophyta, coniferophyta, and gnoteophyta.
sporphyte stage dominates