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16 Cards in this Set

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  • Back
13. List the main characteristics of a population.
Geographic distribution-or range/area, density-#/area & growth rate

4th-population's age structure
14. Write the equation for population density.
# individuals/unit area
15. What are the four factors that affect population size?
number of births, number of deaths, number of individuals that enter(immigation) or leave the population(emigration)
16. List three density dependent factors and three density-independent factors that can limit the growth of a population
dependent-competition, predation, parasitism & disease. independent-unusal weather, natural disasters, seasonal cycles, & certain human activities.
17. What is the relationship btw competition and population size?
The larger the pop. competition for resources, exhaust resources.
The smaller the pop. more resources less competition.
organisims compete for food, water, space, sunlight and other essentials of life.
18. If an entire lynx population disappears, what is likely to happen to the hare population on which it preys?
The hare population should increase.
19. Explain Figure 5-10 What is the graph depicting?
exponential growth.
20. For most of human existence, the population grew slowly, why?
Food was scarce, incurable diseases were rampant, 1/2 children survived to adulthood, life was harsh.
21. What happened 500 yrs. ago to increase human populations?
Agriculture & industry made life easier/safer. Food supply more reliable, essential goods shipped around globe. Improve sanitation, medicine, health care reduced death rate. Birthrates remained high.
22. Why can't populations continue to grow exponentially?
Earth & its resources are limited.
23. What do demographers study?
Examine characteristics of human populations & attempts explain how those populations will change over time.
24. How can improvement in health care affect a population?
advances in nutrition, sanitation, medicine more children survive to become adults. Lower death rate.
25. What is a demographic transition?
A dramatic change in birth & death rates. Births exceed deaths-pop increases. Births falls-pop growth slows. demographic transition complete when birth meats death rate-pop growth stops.
26. Which countries have completed the trasition? How did they accomplish this transition?
US, Europe, & Japan. Birth rates low to meet the death rate-pop growth stops.
27. The diagrams in Fig. 5-13 represent what? According to the data in the figure, what can be concluded about the future of the U.S. and Rwanda
The graphs compare the age structure of US pop. w/ pop of Rwanda. Rwanda age structure predicts a pop. that will double in about 30 yrs.
US-slow and steady growth rate
Rwanda-more teen means double in 30 yrs.
28. According to figure 5-14 what evidence do you see that supports the hypothesis that this country has not completed the transition?
Many people in the stree in India. Pop increase. Birthrate has not fallen to meet death rate-pop growth has not stopped.