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Biology ch. 5

Populations

QuestionAnswer
three important characteristics of a population are its __________ distribution, ________, and ____ rate geographic, density, growth
number of individuals per unit area population density
name the three factors that can affect a population size number of births, number of deaths, number of individuals that enter or leave the population
movement of individuals into an area immigration
movement of individuals out of a population emigration
occurs when individuals in a population reproduce at a constant rate exponential growth
under ideal conditions with unlimited resources, a population will grow _________ exponentially
true/false as resources become less available, the growth of a population slows or stops true
occurs when a populations growth slows or stops following a period of exponential growth logistic growth
largest number of organisms an environment can hold carrying capacity
a factor that causes population growth to decrease limiting factor
a limiting factor that depends on population size density-dependent limiting factor
density-dependent limiting factors include _______, ________,and _______ competition, predation, and disease
the best known mechanisms of population control predator-prey relationship
affect all populations in similar ways, regardless of population size density independent factors
WHEN PREDATORS BECOME CROWDED, ORGANISMS COMPETE FOR THE ESSENTIALS OF LIFE competition
unusual weather, natural disasters, seasonal cycles, and certain human activities are all examples of density _________ factors independent
true/false as a general rule, density dependent are abiotic and density independent factors are biotic false
like the populations of many other living organisms, the size of the human population tends to( increase/decrease )with time increase
the scientific study of human populations demography
true/false birthrates, deathrates, and the age structure of population help predict why some countries have high growth rates while other countries grow more slowly true
a dramatic change in birth rates and death rates demographic transition
graph the numbers of people in different age groups in the population age-structure diagrams
Created by: ebony5407
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