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Pete Science Unit
From Bacteria to Plants
| Term | Definition |
|---|---|
| Algae | Plantlike protists |
| Algal Bloom | The rapid growth of a population of algae |
| Angiosperm | A flowering plant that produces seeds enclosed in a protective structure |
| Antibiotic | A chemical that can kill bacteria without harming a person's cells |
| Antibiotic Resistance | The ability of bacteria to withstand the effects of an antibiotic |
| Asexual Reproduction | A reproductive process that involves only one parent and produces offspring that are identical to the parent |
| Autotroph | An organism that makes its own food |
| Bacteria | Single-celled organisms that lack a nucleus |
| Bacteriophage | A virus that infects bacteria |
| Binary Fission | A form of asexual reproduction in which one cell divides to form two identical cells |
| Binomial Nomenclature | The system for naming organisms in which each organism is given a unique, two-part scientific name indicating its genus and species |
| Budding | A form of asexual reproduction of yeast in which a new cell grows out of the body of a parent |
| Cambium | A layer of cells in a plant that produces new phloem and xylem cells |
| Cell | The basic unit of structure and function in an organism |
| Chlorophyll | A green pigment found in the chloroplasts of plants, algae, and some bacteria |
| Chloroplast | A plant cell structure in which photosynthesis occurs |
| Cilia | The hairlike projections on the outside of cells that move in a wavelike manner |
| Classification | The process of grouping things based on their similarities |
| Cone | The reproductive structure of a gymnosperm |
| Conjugation | The process in which a unicellular organism transfers some of its genetic material to another organism |
| Contractile Vacuole | The cell structure that collects extra water from the cytoplasm and then expels it from the cell |
| Controlled Experiment | An experiment in which all factors are identical except one |
| Cotyledon | A seed leaf; sometimes stores food |
| Cuticle | The waxy, waterproof layer that covers the leaves and stems of most plants |
| Cytoplasm | The region of a cell located inside the cell membrane (in prokaryotes) or between the cell membrane and the nucleus (in eukaryotes); contains a gel-like material and cell structures |
| Decomposer | An organism that breaks down chemicals from dead organisms and returns important materials to the soil and water |
| Dicot | An angiosperm that has two seed leaves |
| Embryo | The young organism that develops from a zygote |
| Eukaryote | An organism whose cells contain nuclei |
| Eutrophication | The buildup over time of nutrients in freshwater lakes and ponds that leads to an increase in the growth of algae |
| Evolution | The process by which species gradually change over time |
| Fertilization | The joining of a sperm cell and an egg cell |
| Flagellum | A long, whiplike structure that helps a cell to move |
| Flower | The reproductive stucture of an angiosperm |
| Fossil | A trace of an ancient organism that has been preserved in rock or other substance |
| Fruit | The ripened ovary and other structures of an angiosperm that enclose one or more seeds |
| Fruiting Body | The reproductive structure of a fungus that contains many hyphae and produces spores |
| Fungus | A eukaryotic organism that has cell walls, uses spores to reproduce, and is a heterotroph that feeds by absorbing its food |
| Gametophyte | The stage in the life cycle of a plant in which the plant produces gametes, or sex cells |
| Genus | A classification grouping that consists of a number of similar, closely related species |
| Germination | The sprouting of the embryo out of a seed; occurs when the embryo resumes its growth |
| Gymnosperm | A plant that produces seeds that are not enclosed by a protective fruit |
| Heterotroph | An organism that cannot make its own food |
| Homeostasis | The maintenance of stable internal conditions |
| Host | An organism that provides a source of energy or a suitable environment for a virus or another organism to live |
| Hyphae | The branching, threadlike tubes that make up the bodies of multicellular fungi |
| Infectious Disease | An illness that can pass from one organism to another |
| Lichen | The combination of a fungus and either an alga or an autotrophic bacterium tat live together in a mutualistic relationship |
| Monocot | An angiosperm that has only one seed leaf |
| Multicellular | Consisting of many cells |
| Mutualism | A type of symbiosis in which both partners benefit from living together |
| Nonvascular Plant | A low-growing plant that lacks true vascular tissue |
| Nucleus | The dense area in a eukaryotic cell that contains nucleic acids, the chemical instructions that direct the cell's activities |
| Organism | A living thing |
| Ovary | A flower structure that encloses and protects ovules and seeds as they develop |
| Ovule | A plant structure in seed plants that produces the female gametophyte; contains an egg cell |
| Parasite | An organism that lives on or in a host and causes harm to the host |
| Phloem | The vascular tissue through which food moves in some plants |
| Photosynthesis | The process by which plants and some other organisms capture and use light energy to make food from carbon dioxide and water |
| Pigment | A chemical that produces color |
| Pistil | The female reproductive part of a flower |
| Pollen | Tiny particles (male gametophytes) produced by seed plants that contain the cells that later become sperm cells |
| Pollination | The transfer of pollen from a male reproductive structure to a female reproductive structure |
| Prokaryote | An organism whose cells lack a nucleus and some other cell structures |
| Protist | A eukaryotic organism that cannot be classified as a plant, animal, or fungus |
| Protozoan | An animal-like protist |
| Pseudopod | A "false foot" or temporary bulge of cytoplasm used for feeding and movement in some protozoans |
| Red Tide | An algal bloom that occurs in salt water |
| Respiration | The process of breaking down food to release its energy |
| Response | An action or change of behavior that occurs as a result of a stimulus |
| Ribosome | A tiny structure located in the cytoplasm of a cell where proteins are produced |
| Root Cap | A structure that covert the tip of a root, protecting the root from injury |
| Seed | The plant structure that contains a young plant inside a protective covering |
| Sepal | A leaflike structure that encloses the bud of a flower |
| Species | A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce |
| Spontaneous Generation | The mistaken idea that living things arise from nonliving sources |
| Spore | A tiny cell that is able to grow into a new organism |
| Sporophyte | The stage in the life cycle of a plant in which the plant produces spores |
| Stamen | The male reproductive part of a flower |
| Stimulus | A change in an organism's surroundings tat causes the organism to react |
| Stomata | The small openings on the surfaces of most leaves through which gases can move |
| Symbiosis | A close relationship between two organisms in which at least one of the organisms benefits |
| Taxonomy | The scientific study of how living things are classified |
| Tissue | A group of similar cells that perform a specific function in an organism |
| Toxin | A poison that can harm an organism |
| Transpiration | The process by which water is lost through a plant's leaves |
| Unicellular | Made of a single cell |
| Vaccine | A substance introduced into the body to stimulate the production of chemicals that destroy specific disease-causing viruses and organisms |
| Vacuole | A large sac-like storage are in a cell |
| Vascular Plant | A plant that has true vascular tissue |
| Vascular Tissue | The internal transporting tissue in some plants that is made up of tube like structures |
| Virus | A tiny, nonliving particle that invades and ten reproduces inside a living cell |
| Xylem | The vascular tissue through which water and nutrients move in some plants |
| Zygote | A fertilized egg |