Ch. 22: Introduction to Plants

seed: plant embryo and a food supply encased in a protective covering
gymnosperm: group of seed plants that bear their seeds within a layer of tissue that protects the seed; also called flowering
angiosperm: group of seed plants that bear their seeds within a layer of tissue that protects the seed; also called flowering
pollen grain: structure that contains the entire male gametophyte in seed plants
pollination: transfer of pollen from the male reproductive structure to the female reproductive structure
seed coat: tough covering that surrounds and protects the plant embryo and keeps the contents of the seed from drying out
ovule: structure in seed cones in which the female gametophyte develop
pollen tube: structure in a plant that contain two haploid sperm nuclei
annual plant: only last about a year
perennial plant: comes back year after year, constantly growing

ovary: in plants, the structure that surrounds and protects seeds
fruit: structure in angiosperms that contains one or more of a seed plant
monocot: angiosperm with one seed lead in its ovary
dicot: angiosperm with two seed leaves in its ovary
woody plant: type of plant made primarily of cells with thick cell walls that support the plant body; includes trees, shrubs, and vines
herbaceous plant: type of plant that has smooth and non-woody stems; includes dandelions, zinnias, petunias, and sunflowers