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LD BIO CH 24
LD BIO CH 24 SEXUAL REPRODUCTION IN PLANTS
| Term | Definition |
|---|---|
| GYMNOSPERMS | a seed plant whose seeds are not enclosed within a fruit |
| ANGIOSPERMS | flowering plants |
| ALTERNATION OF GENERATIONS | the alternation between haploid and diploid plant forms |
| GAMETOPHYTE | a gamete-producing plant |
| SPOROPHYTE | a spore-producing plant |
| MOSSES | any of a class of bryophytes; small, simple, green plants that grow in most environments |
| RHIZOIDS | rootlike hyphae that anchor a fungus, secrete digestive enzymes, and absorb nutrients |
| ANTHERIDIUM | the male gametophyte in mosses |
| ARCHEGONIUM | the female gametophyte in mosses |
| FERNS | a type of spore-diapering tracheophyte |
| SEED | the structure formed from the ovule following fertilization; contains the plant embryo, stored nutrients, and a seed coat. |
| SEED COAT | a tough, protective covering around a seed that develops from the wall of the ovule. |
| POLLEN GRAIN | the male gametophyte of a seed plant |
| OVULE | in seed plants, a structure within the ovary that contains a female gametophyte and that develops into a seed after fertilization |
| POLLINATION | the transfer of pollen from an anther to a stigma of a flower |
| MICROPYLE | a small opening in the ovule through which the pollen tube grows |
| POLLEN TUBE | the tube-like outgrowth of the pollen grain through which the sperm nuclei pass to the ovule. |
| PEDICEL | the stalk that bears a single flower |
| RECEPTACLE | the expanded end of the pedicel, to which the flower parts are attached. |
| SEPALS | the leaf-like structures at the base of the flowers |
| CALYX | the complete circle of sepals in a flower |
| PETALS | the usually showy flower structures located between the sepals and the stamens |
| COROLLA | the complete circle of petals in a flower |
| STAMENS | the organ of a flower that bears pollen grains |
| ANTHER | the sac-like structure of a stamen in which pollen grains are produced |
| PISTIL | the part of the flower that contains the ovules and through which pollen tubes grow |
| FILAMENT | the starlike part of a stamen that supports the anther |
| STIGMA | in a pistil, the enlarged, sticky knob on top of a style that receives the pollen |
| STYLE | the part of the pistil between the stigma and the ovary |
| OVARY | the basal part of the pistil, which contains ovules and later seeds and which develops into a fruit. |
| FRUIT | a structure that develops from the ovary and associated flower parts after fertilization, contains seeds |
| EMBRYO SAC | the mature female gametophyte of a flowering plant |
| POLAR NUCLEI | the two nuclei found within the embryo sac |
| NECTAR | a sugary liquid produced by flowers |
| DOUBLE FERTILIZATION | in flowering plants, the fertilization of the egg and of the two polar nuclei to form the diploid zygote and the triploid endosperm nucleus, respectively |
| ENDOSPERM | the tissue that develops from the endosperm nucleus, often serving as a food supply for the plant embryo. |
| COTYLEDON | a modified leaf of a seed plant embryo, often provides nourishment for the developing seedling. |
| MONOCOTS | the flowering plants whose seeds have one cotyledon |
| EPICOTYL | the part of a plant embryo above the point of attachment of the cotyledons; gives rise to the terminal bud, leaves, and stem |
| HYPOCOTYL | the part of a plant embryo between the radicle and the point of attachment of the cotyledons |
| RADICLE | the root portion of a seed embryo |
| DICOTS | the plants whose seeds have two cotyledons |
| DORMANCY | a period during which growth and other metabolic activities stop are are several reduced. |
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desilva13
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