# Population Growth Activity Date Per

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1 Population Growth Activity Name Date Per Objectives: You will graph the population growth of different populations and use it to predict future growth. You will identify factors that affect population growth. A. Human Population Growth Prior to 1950, the death rate was high, which kept the numbers of humans from increasing rapidly. In the 19th Century, the agricultural revolution increased food production. The industrial revolution improved methods of transporting food and other good. In the 20th Century, advances in medicine, sanitation and nutrition have decreased the death rates further. These factors combined to produce the rapid growth of the human population in the 20th century. As with any population, humans are also limited by factors such as space, amount of food and disease. The carrying capacity is the number of individuals that a stable environment can support. Authorities disagree on the maximum number of people that the earth can support, though the numbers generally range for 8 to 10 billion. As the population approaches its limit, starvation will increase. Some countries have a much higher growth rate than others. Growth rate is the number of people born minus the number of people that die. Most countries are trying to reduce their growth rate. Zero population growth means that as many people are being born as there are dying - to achieve zero population growth, each couple would need to have no more than two children (to replace the parents). Even if this number is achieved, the population will continue to grow because the parents will still live on for decades, as their children have children and their children have children, and so forth. The United States reached zero population growth in the 1980's, and yet the overall population of the US still increases. The earth s known human population size is reported in the table below. First graph the data and then answer the analysis questions. Make sure to use all of the space given for the graph. Table 1. Earth s Human Population Size Year A.D. Number of People (in billions)

2 Analysis 1. It took 1,649 years for the world population to double, going from 0.25 billion people to 0.50 billion people. How long did it take for the population to double a second time? 2. How long did it take for the population to double a third time? A fourth time? 3. Based on your graph, in what year will the population reach 8 billion?

3 4. Define the following termsa) Exponential growth- b) Logistic growth- c) Carrying capacity- d) Limiting factors- 5. What factors contributed to the world's overall population growth in the last 150 years? 6. If the carrying capacity of the earth was 9 billion people, when would this number be reached (according to your graph)? 7. What will happen when the human population exceeds the earth's carrying capacity? 8. Use the graph below to answer the questions that follow. a) Which country looks like it is experiencing exponential growth? b) Which country looks like it has reached its carrying capacity?

4 c) Because it has reached its carrying capacity, describe the relationship between its birth rates and death rates. d) Describe what is happening to Europe s population size in terms of birth rates and death rates. e) Which country or countries could be experiencing: emigration: Explain your answer. immigration: Explain your answer. 9. Read the CAUSE on the left hand side of the table below. Then, predict the EFFECT of the cause in the right-hand column. For the last one, fill in the CAUSE portion of the table. Cause During the 1920s, many Eastern European people leave their countries to come to the United States. Effect During the 1920 s, many Eastern European people enter the United States. Many more babies were born in the post-world War II era than in the pre-world War II era. China imposed a one child only policy in 1979 which is still in effect today. Seals are hunted for their meat and fur in some regions, resulting in many deaths of seals.

5 B. Deer: Predation or Starvation Background Information: In 1970 the deer population of an island forest reserve about 518 square kilometers in size was about 2000 animals. Although the island had excellent vegetation for feeding, the food supply obviously had limits. Thus the forest management personnel feared that overgrazing might lead to mass starvation. Since the area was too remote for hunters, the wildlife service decided to bring in natural predators to control the deer population. It was hoped that natural predation would keep the deer population from becoming too large and also increase the deer quality (or health), as predators often eliminate the weaker members of the herd. In 1971, ten wolves were flown into the island. The data collected during this program are shown in the following table. The Population Change is the number of deer born minus the number of deer that died during that year. Fill in the last column for each year. The first has been calculated for you. Then graph the deer and wolf populations on the graph below. Use one color to show deer populations and another color to show wolf populations. Year Wolf Population Deer Population Number of Deer Offspring Predation Starvation Deer Population Change , , ,500 1, , , , , , , , ,

6 Analysis: 1. What is a density-dependent limiting factor? 2. When do density-dependent factors operate most strongly? 3. List four density-dependent limiting factors? a. b. c. d. 4. Describe what happened to the deer and wolf populations between 1971 and What happened to the deer population when the number of wolves was low? 6. What do you think would have happened to the deer on the island had wolves NOT been introduced? Explain your answer. 7. What is the relationship between the deer and the wolves on the island? 8. Is the number of deer on the island a density-dependent or density-independent limiting factor for the wolf? Explain your answer.

7 9. Read each situation in the chart below. Then, state if it is a density-independent limiting factor or a density-dependent limiting factor. Then, state the specific limiting factor that is occurring. The first one is done for you as an example. Situation Mrs. Engelbrecht has 32 students assigned to her Biology class, but she only has room for 28. Because the room is so crowded, the extra 4 students leave the room to go to Guidance and have their schedules changed. Northern pike (it s a fish) feed on another fish, the yellow perch. An increase in the yellow perch population causes an increase in the northern pike population. The BP oil spill in the Gulf of Mexico has harmed many aquatic organisms that live in the Gulf region. A new strain of influenza (the flu) breaks out in New York City. A population of rabbits and a population of deer are both feeding off the same plants in the same habitat. Hurricane Katrina forced thousands of people to leave New Orleans. 65 million years ago, a large asteroid collided with the Earth. As a result, large amounts of ash were ejected into Earth s atmosphere. Density-independent or Density-dependent? Density-dependent Limiting Factor: emigration

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