APES2

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School

University of Houston *

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Course

4356

Subject

Mathematics

Date

Apr 3, 2024

Type

jpg

Pages

1

Uploaded by UltraResolveHamster20

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Unit 3 Populations APES Exam Review Population Math ’ vd| ® 1) Write the equation for the rule of 70: 770 = doubling time. How is it used? It is used to find out how long it ’ will take for a population to double if it continues to grow at a constant rate. This can be used to find the @'& ‘i population at a future date ( when the date is a multiple of the doubling time) 2) Perform the following calculations: (Show all of your work in a logical progression to the final answer.) a. Acity has a population of 50,000 in 2012. If the population of the city grows at an annual rate of 2%, the year in which the population will reach 100,000 is and the year it will reach 200,000 is Show work: 100,000 is 2x 50,000, so we’re looking for how long it will take to double the population. 72—0 = 35 years, 2012 + 35 = 2047, therefore: population will reach 100,000 in 2047, and will reach 200,000 in 2047+ 35 = 2082 (doubling again). b. A country’s population was 12 million in 1992 and in 2012 it was 24 million. If the population grew at a constant rate, that percent rate of growth was Show work: 2012-1992 = 20 years - this was the doubling time, so 7—r0 = 20, so growth rate is 3.5% c. Perform the following calculation. Show all of your work. In a particular year a population has the following characteristics: the crude birth rate is 45, the crude death rate is 20, the immigration rate is 1%, and the emigration rate is 0.5%. The percent rate of growth for that year is Show work: (CBR + immigration) — (CDR + emigration) _ r 10 & (45+10) - (20+5) 10 percent to per thousand for the equation) = 3% (You have to multiply the immigration and emigration by 10 to change them from Population Changes and Population Momentum 3) What are the four factors used to determine population growth? What is the equation? (CBR + immigration) — (CDR + emigration) _ birth rate, death rate, emigration, and immigration - 8 4) From the equation in #3, what factors add organisms to a population? Which ones remove organisms from a population? add - births & immigration remove - deaths and emigration 5) What is population momentum? Population momentum occurs when a large portion of a population is of reproductive age, and even though the fertility rate is low, the large number of individuals reproducing means that the population continues to grow. R vs K Selected Species 6) List two characteristics of an r-selected species. a) early sexual maturity, large numbers of offspring, little or no parental care, small bodied
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