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Ch. 4 - Population Biology
Ch. 4 - vocabulary
10
Science
10th Grade
10/18/2012

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Term
population growth
Definition
an increase in the size of a population over time
Term
exponential growth
Definition
as a population gets larger, it also grows faster; this type of growth forms a J-shaped graph
Term
carrying capacity
Definition
the number of organisms of one species that an environment can support.
Term
density-dependent factors
Definition
these factors have an increased effect as population increases; things like disease, competition, parasites, and food.
Term
Density-independent factors
Definition
these factors affect all populations regardless of the population's density; things like floods, storms, drought, and habitat disruption.
Term
demography
Definition
the study of human population growth characteristics.
Term
fertility rate
Definition
the number of offspring a female produces during her reproductive years.
Term
immigration
Definition
movement of individuals INTO a population
Term
emigration
Definition
movement of individuals out of a population; EXITING the population.
Term
age structure
Definition
this refers to the proportions of a population that are at different age levels; can be visualized by the use of an age structure graph.
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