| A | B |
|---|
| gymnosperms | seed plants that bear seeds directly on the surfaces of cones |
| angiosperms | seed plants that bear their seeds within a layer of protective tissue |
| cones | seed-bearing structures of gymnosperms |
| flowers | seed-bearing structures of angiosperms |
| pollination | transfer of pollen from the male reproductive structure to the female reproductive structure |
| pollen grain | male gametophyte of seed plants |
| seed | an embryo encased in a protective covering |
| embryo | early developmental stage of an organism |
| seed coat | structure that surrounds and protects the plant embryo |
| cycads | palm-like plants that reproduce using cones |
| ginkgoes | gymnosperms resistant to air pollution |
| conifers | most common gymnosperms, including pines and spruces |
