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Semester 1 Vocab

Review for Semester 1 Vocabulary - Grade 8 Science

TermDefinition
organism a living thing
cell the basic unit of structure and function in an organism
unicellular made of a single cell
multicellular consisting of many cells
autotroph an organism that makes its own food
heterotroph an organism that cannot make its own food
prokaryote an organism whose cells lack a nucleus and some other cell structures
eukaryote an organism whose cells contain nuclei
virus a tiny, nonliving particle that invades and then reproduces inside a living cell
host an organism that provides a source of energy or a suitable environment for a virus or another organism to live
parasite an organism that lives on or in a host and causes harm to the host
bacteria single-celled organisms that lack a nucleus; prokaryotes
decomposer an organism that breaks down chemicals from dead organisms and returns important materials to the soil and water
protist an eukaryotic organism that cannot be classified as an animal, plant, or fungus
symbiosis a close relationship between two organisms in which at least one of the organisms benefit
mutualism a type of symbiosis in which both partners benefit from living together
fungus an eukaryotic organism that has cell walls, uses spores to reproduce, and is a heterotroph that feeds by absorbing its food
photosynthesis the process by which plants and some other organisms capture and use light energy to make food from carbon dioxide and water
zygote a fertilized egg
chlorophyll a green pigment found in the chloroplasts of plants, algae, and some bacteria
phloem the vascular tissue through which food moves in some plants
xylem the vascular tissue through which water and nutrients move in some plants
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
angiosperm a flowering plant that produces seeds enclosed in a protective structure
tropism the growth response of a plant toward or away from a stimulus
stimulus a change in an organism's surroundings that causes the organism to react
annual a flowering plant that completes its life cycle in one growing season
biennial a flowering plant that completes its life cycle in two years
perennial a flowering plant that lives for more than two years
plant the kingdom that contains only multicellular autotrophic eukaryotes
animal the kingdom that contains only multicellular heterotrophic eukaryotes
response an action or change in behavior that occurs as a result of a stimulus
Created by: gsaliba