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29 terms

Chapter 1 ecology test

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ecosystem
Living and nonliving things in an environment, together with their interactions
habitat
Place where an organism lives and that provide the things that needs
biotic factor
a living part of an ecosystem
abiotic factor
a nonliving part of an ecosystem
photosynthesis
process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches or other animal eats plant to obtain food.
species
a group of similar organisms that can mate with each other and produce fertile offsprin
population
Group of one species that live in the same area
community
populations of different species living in a defined area
ecology
the study of the relationship between organisms and their environment
population density
the number of individuals per unit area
estimate
An approximation of a number based on reasonable assumptions
birth rate
the number of births in a population in a certain amount of time
death rate
the number of deaths in a population in a certain amount of time
immigration
moving in to the population
emigration
leaving a population
limiting factor
an environmental factor that prevents a population from increasing
carrying capacity
largest number of individuals of a population that a environment can support
natural selection
the changes that make organism better suited to their environments.
adaptations
the behaviors and physical characteristics that allow organisms to live successfully in their environments
niche
how an organism makes a living (how survives in its environment)
competition
the struggle between organisms to survive in a habitat with limited resources
predation
interaction in which one organism kills and feeds on another organism
predator
the organism that does the killing
prey
an organism that is killed and eaten by another organism
symbiosis
a close relationship between two species that benefits at least one of the species
mutualism
a relationship between two species in which both species benefit
commensalism
symbiotic relationship in which one member of the association benefits and the other is neither helped nor harmed
parasitism
A relationship between two organisms of different species where one benefits and the other is harmed
host
the organism that a parasite or virus lives in or on