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Biology Chapter 5

Final Review

QuestionAnswer
Factors that affect population size Number of births (nativity), number of deaths (mortality), number of individuals that enter or leave.
Exponential growth occurs when individuals reproduce at a constant rate with ideal conditions and unlimited resources. Continues until resources become less available and does not continue in natural populations for very long.
Logistic growth when resources become less available, the growth slows or stops growing exponentially.
Limiting factor factor that causes population growth to decrease
Density-dependent limiting factor limiting factor that depends on population size. Include competition, predation, parasitism, and disease.
What do organisms compete for? Food, water, space, sunlight, other necessities.
Predator-prey relationship mechanism of population control in which a population is regulated by predation.
Parasites are like predators b/c they take nourishment at the host's expense
Density Independent Factors Unusual weather, natural disasters, seasonal cycles, human activities. Affect regardless of population size.
Human Population Growth increases over time. Life used to be harsh and limiting factors kept population sizes low for humans. 500 yrs ago, there was improved sanitation and health care. Industry made life easier and safer. The world's food suply became more reliable.
Demography scientific study of human populations
Factors that help predict why the populations of some countries grow faster. Birthrates, deathrates, age structures
Demographic transition population growth slows down in developed countries. Modernization lowers the death rate, and the population grows. The birthrate falls eventually, and the growth slows, and eventually stops.
Age structure diagrams graph the number of ppl in different age groups in a population
Population in 2050 7.8 billion
Created by: numchuckskillz
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