| A | B |
|---|
| Conifer | A gymnosperm whose reproductive structure is the cone. Include: pines, firs, redwoods, and other large trees |
| Tracheids | A water-conducting and supportive element of xylem composed of long, thin cell walls with tapered ends and walls hardened with lignin |
| Vessel elements | A specialized short, wide cell in angiosperms; arranged end to end, they form continuous tubes for water transport |
| Fiber | A lignified cell type that reinforces the xylem of angiosperms and functions in mechanical support; a slender, taper sclerenchyma cell that usually occurs in bundles |
| Flower | Reproductive organ of angiosperm plants especially one having showy or colorful parts |
| Sepal | A whorl of modified leaves in angiosperms that encloses and and protects the flower bud before it opens |
| Petal | One of a circle of modified leaves immediately outside the reproductive organs of a flower; usually brightly colored |
| Stamen | The male reproductive organ of a flower |
| Carpel | The female reproductive organ of a flower, consisting of the stigma style, and ovary |
| Filament | The stalk of a stamen |
| Anther | The terminal pollen sac of a stamen, inside which pollen grains with male gametes form in the flower of an angiosperm |
| Stigma | The receptive tip of the carpel, which receives pollen at pollination and on which the pollen grain germinates |
| Style | Part of the carpel that connects the stigma to the ovary |
| Ovary | Part of the carpel at its base that contains one or more ovules |
| Fruit | In plants, it is the thickened ovary wall encasing fertilized ovules and that protects dormant seeds and helps in their dispersement |
| Embryo Sac | Female gametophyte consisting of a few cells with one being the egg cell. |
| Cross-Pollination | transfer of pollen from an ather of a flower on one plant to the stigma of a flower on another plant of the same species in angiosperms |
| double fertilization | a mechanism of fertilization in angiosperms, in which 2 sperm cells unite with 2 cells in the embryo sac to form the zygote and endosperm |
| cotyledons | sporophyte embryo with a rudementary root and 1 or two seed leaves |
| endosperm | tissue rich in starch and other food reserves |
| coevolution | evolution of two species with each one influencing the other's mutations |
