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Acc. Biology Chapter 5
Simon Kenton
20
Biology
10th Grade
07/09/2011

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Term
Population
Definition

A group of individuals of the same species occupying an area

Term
Population Density
Definition
Number of individuals in an area
Term
Growth Rate
Definition

An increase or decrease of the number of individuals in a population

Term
Population size increases due to...
Definition

Birth rates

Immigration

Term
Population size decreases due to..
Definition

Deaths

Emigration

Term
Immigration
Definition
Movement of organisms into an environment
Term
Emigration
Definition
Movement of organisms out of a population
Term
Zero Population Growth
Definition
Number of births equals the number of deaths
Term
Exponential Growth
Definition
  • The increase of a population under ideal conditions with unlimited resources
  • Graph looks like a J shaped curve
Term
Logistic Growth
Definition
  • A population grows rapidly and levels off once carrying capacity is reached
  • Graph looks like a S shaped curve
Term
Carrying Capacity
Definition

The maximum number of individuals an environment can support

Term
Limiting Factor
Definition
A factor that causes population growth to decrease
Term
Density-Dependent Factor
Definition

A limiting factor that depends on population size

Ex. competition, disease, food supply

Term
Density-Independent Factor
Definition
  • A limiting factor that affects all populations regardless of the population size
  • Ex. storms, fire, flood, pollution, tornado
Term
Demography
Definition
The study of human population growth
Term
Age Structure Diagrams
Definition

The population of a country broken down by gender and age group

Term
Rapid Growth
Definition
[image]
Term
Slow Growth
Definition
[image]
Term
Negative Growth
Definition
[image]
Term
Zero Growth
Definition
[image]
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