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Topic 1 -Liv. Things

7th grade LIfe Science

TermDefinition
organism any living thing
cell basic unit of structure and function in living things
unicellular single-celled organism
multicellular organisms made up of many cells
stimulus any change in the environment that can make an organism react
response an action or change in behavior
homeostasis maintenance of stable internal conditions
spontaneous generation mistaken idea that living things arise from nonliving sources
species a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce
classification the process of grouping things based on their similarities
genus first word in an organism's name; a group of similar, closely related organisms
binomial nomenclature two-part scientific name that indicates its genus and species
taxonomy the scientific study of how organisms are classified
domain the broadest level of organization
evolution the process of change over time
convergent evolution the process by which unrelated organisms evolve similar characteristics
virus a tiny, nonliving particle that enters and then reproduces inside a living cell
host an organism that provides a source of energy or environment for a virus to live
vaccine a substance that consists of weakened or killed pathogens that causes the body to produce chemicals to destroy it
bacteria single-celled, prokaryotic organisms that lack a nucleus
protists eukaryotic organisms that can not be classified as plants, animals or fungi
tissues a group of similar cells that perform a specific function
vascular plants plants that have tissues used to transport food, water and minerals through tube like structures
non-vascular plants plants that do NOT have tissues used for transporting materials
symmetry a balance of body parts
organ a body structure composed of different kinds of tissues that work together
vertebrate animal with a back bone
invertebrate animal without a backbone
mammal vertebrate whose body temperature is regulated by internal heat, has skin with hair/fur, and glands that produce milk
Created by: Science4u
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