| A | B |
|---|
| sepals | the outermost circle of flower parts-usually green and resembling leaves |
| petals | the second circle of flower parts-often brightly colored and found just inside the sepals |
| corolla | all of the petals in a flower form this |
| calyx | all of the sepals in a flower together form this |
| fertile leaves | contain the structures that produce male and female gametophytes |
| stamens | male reproductive structure of a flower belonging to the first circle of fertile leaves located just inside the petals |
| filament | the long thin structure that supports the anther |
| anther | stucture in which the male gametophytes are produced in flowering plants |
| carpels | structure produced from fertile leaves that have rolled up to comprimise the centermost circle of flower parts |
| pistil | female reproductive structure in a flower formed from one or more carpels; consists of the ovary, style and stigma |
| ovary | base of the pistil that contains ovules and developing gametophytes |
| style | stalk between the stigma and the ovary in a flower |
| sitgma | upper part of a pistil upon which pollen grains are deposited |
| polar nuclei | two nuclei in the embryo sac of angiosperms that locate themsleves in the center of the sac during fertilization |
| ovules | specialized reproductive structure in seed plants |
| embryo sac | female gametophyte within the ovule of a flower |
| egg nucleus | nucleus in the embryo sac of angiosperms that locates itself close to the opening of the ovule and enlarges to become the female gamete |
| pollen chambers | structure in anther that produces microspore mother cells |
| tube nucleus | nucleus that results from the miotic division of the nuclues of a pollen grain during the pollination of a flower |
| generative nucleus | nuclues that results from the miotic division of the nucleus of the pollen grain in angiosperms; divides to form the two sperm cells involved in double fertilization |
| pollination | transfer of pollen from the anther of a stamen to the stigma of a pistil |
| self pollination | process in which pollen falls from the anther to the stigma of the same flower or betweeen flowers of the same plant |
| cross pollination | transfer of pollen from the flower of one plant to the flower of another plant |
| pollen tube | structure that growns once a pollen grain has landed on the stiga in order to bring the sperm cells to the egg nucleus |
| sperm nuclei | nucleus in the angiosperms that results when the generative nucleus within the pollen grain divides |
| double fertilization | process that occurs in angiosperms in which one sperm nuclues fuses with the egg nucleus to form the zygote and one sperm nucleus fuses with the nuclei that flank the egg nucleus to form the endosperm |
| fruit | protective structure formed from an enlarged thickened ovary wall that contains angiosperm seeds |
| cotyledons | seed leaves on angiosperms |
