Review question chap7
- 1. Student’s Name: Sem Meng Eang ID: #03058 (BA-22M) Review Questions Chap7 2/ List three characteristics populations might have. Natality- birthrate Mortality- death rate Sex ratio- male vs. female 5/ List four factors that could determine the carrying capacity of an animal species. Availability of raw materials (oxygen, water, oxygen) Availability of energy (sunlight) Collection of waste products and disposal means Interaction among other organisms 6/ How do the concepts of birthrate and population growth differ? A population growth is the birthrate plus immigration minus the death rate plus emigration. The birthrate is the number of individual born per 1000 individual each year. 8/ How do K-strategists and r-strategists differ? K-strategists R-strategists Large organisms Reach a stable population their carrying capacity Environment stable Tend to be larger Relatively long lived Relatively few young Much maternal care Small organisms Never reach C.C Environment unstable Usually small Short life span Large amounts of young Little or no maternal care 9/ As the human population continues to increase, what might happen to other species? Other species might die because human might eat them for food or just simply destroy the species habitat to meet the human standard. 10/ All successful organisms overproduce. What advantage does this provide for the species? What disadvantages may occur? Disadvantage: They use a lot of main sources. It does not have enough homes and food etc. Advantage: They provide the stable population, new place, new standard of living, and new culture. 14/ List 5 differences between your standard of living and that of someone in a less-developed country. Low Education Less Health care Inadequate Social network Less modern Technology Inadequate Nutrition
- 2. 15/ Why do people who live in overpopulated countries use plants as their main source of food? People who live in overpopulated countries use plants as their main source of food because they cannot afford the 90 percent of energy loss that happen when plants are fed to animal. The same amount of grain can support 10 times more people at herbivore level than at carnivore level. 17/ What role does the status of women play in determining population growth rates? Women play a big role in the population rates. They are the ones who give birth to all the children in the population. Similarly, the number in females is very important, since they finally determine the number of offspring produced in the population. In contrast, most of the developed world, women are more educated, so they delay marriage and have a few children by choice. 18/ Describe three reasons why women in the less-developed world might desire more than two children. They view children as workers Lots of children will take care them well in their old age Women in the less-developed countries are poor educated Key Term Birthrate: The number of individuals born per thousand individuals in the population per year. Carrying Capacity: The optimum number of individuals of a species that can be supported in an area over an extended period of time. Death Rate: The number of deaths per thousand individuals in the population per year. Density-dependent Limiting Factor: Those limiting factors that become more severe as the size of the population increases. Density-independent Limiting Factor: Those limiting factors that are not affected by population size. Dispersal: Migration of organisms from a concentrated population into areas with lower population densities. Emigration: Movement out of an area that was once one’s place of residence. Immigration: Movement into an area where one has not previously to combust. Growth Rate: The amount of increase that a specific variable has gained within a specific period and context. Demographic Transition: The hypothesis that economies proceed through a series of stages, beginning with growing populations with high birth and death rates and low economic development and ending with stable populations with low birth and death rates and high economic development. Demography: The study of human populations, their characteristics, and their changes. Gross National Income: An index that measures the total goods and services generated within a country as well as income earned by citizens of the country who are living in other countries.
- 3. Population Density: A measure of how close organisms are to one another, generally expressed as the number of organisms per unit area. Standard of Living: The necessities and luxuries essential to a level of existence that is customary within a society. Less-developed Country: Countries of the world that typically have a per capita income of less than US $5000. More-developed Country: Countries of the world that typically have a per capita income that exceeds US $10,000; Europe, Canada, United States, Australia, New Zealand, and Japan. Total Fertility Rate: The number of children born per woman per lifetime.