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Grade 6 Environment

Vocabulary Review Ch 1 Environment book

ecosystem all the living and nonliving things that interact and in a particular area
habitat the place where an organism lives and that provides the things the organism needs
biotic factors the living parts of an ecosystem
abiotic factors the nonliving parts of an ecosystem
population all the members of one species in a particular area
community all the different populations that live together in an area
unit of organization in an ecosystem organism, populaton, community, ecosystem
ecology the study of how living things interact with each other and with their environment
population density the number of individuals divided by the unit area
direct observation counting the population one by one
indirect observation counting the tracks, nests, or other signs of the population, then estimating the number of organisms
mark and recapture capture an animal, mark it, release it, recapture and count
birth rate the number of births in a population over a period of time
death rate the number of deaths in a population over a period of time.
immigration moving into a population
emmigration leaving a population
limiting factors an environmental factor the prevents a population from increasing
carrying capacity the largest population that an evironment can support
adaptations the behaviors and physical characteristics of species that allow them to live successfully in their environment
niche an organism's particular role, or how it makes it living
competition the struggle between organisms to survive in a habitat with limited resources
predation an interaction in which one organism kills and eats another
predator the organism that kills another for food
prey an organism that is killed and eaten by a predator
symbiosis a close relationship between two species that benefits at least one of the species
mutualism a relationship is which both species benefit
commensalism a relationship in which one species benefits and the other species is neither helped nor harmed
parasitism a relationship in which one organism lives on or inside another organism and harming it
parasite the organism that benefits in a parasitic relationship
host the organism a parasite lives in or on
estimate the approximation of a number
photosynthesis the process of using water, sunlight, and carbon dioxide to make food
Created by: Dcoleman