Which of the following is NOT one of the factors that play a role in population growth rate?

1. Which of the following is NOT one of the factors that play a role in population growth rate? • immigration • death rate • emigration • demography

2. One of the main characteristics of a population is its • change over time. • geographic distribution. • dynamics. • habitat.

3. Sea otters are important to the populations of • kelp. • sea urchins. • killer whales. • all of the above

4. There are 150 Saguaro cactus plants per square kilometer in a certain area of Arizona desert. To which population characteristic does this information refer? • growth rate • geographic distribution • age structure • population density

5. What does the range of a population tell you that density does not? • the number that live in an area • the areas inhabited by a population • the births per unit area • the deaths per unit area

6. A small farming community in Texas covers 14 square kilometers. There are 420 individuals who live within the town limits. What is the population density of this community? • 0.03 individuals per square kilometer • 53 individuals per square kilometer • 30 individuals per square kilometer • 10.24 individuals per square kilometer

7. Which of the following tells you population density? • the number of births per year • the number of frogs in a pond • the number of deaths per year • the number of bacteria per square millimeter

8. The movement of organisms into a given area from another area is called • immigration. • emigration. • population shift. • carrying capacity.

9. When organisms move out of the population, this is known as • emigration. • abandonment. • immigration. • succession.

10. What must occur in a population for it to grow? • The birthrate becomes higher than the death rate. • The birthrate stays the same and the death rate increases. • The birthrate becomes lower than the death rate. • The birthrate and the death rate remain the same.

11. What is happening in a population as it decreases? • The birthrate and the death rate remain the same. • The death rate becomes lower than the birthrate. • The death rate stays the same and the birthrate increases. • The death rate becomes higher than the birthrate.

12. If immigration and emigration numbers remain equal, which is the most important contributing factor to a slowed growth rate? • increased birthrate • constant death rate • decreased birthrate • constant birthrate

13. Which are two ways a population can decrease in size? • immigration and emigration • increased death rate and immigration • decreased birthrate and emigration • emigration and increased birthrate

14. When individuals in a population reproduce at a constant rate, it is called • logistic growth. • growth density. • exponential growth. • multiple growth.

15. The various growth phases through which most populations go are represented on a(an) • logistic growth curve. • exponential growth curve. • normal curve. • population curve.

16. As resources in a population become less available, the population • declines rapidly. • increases slowly. • reaches carrying capacity. • enters a phase of exponential growth.

17. Which factor might NOT contribute to an exponential growth rate in a given population? • lower death rates • higher birthrates • less competition • reduced resources

18. In a logistic growth curve, exponential growth is the phase in which the population • reaches carrying capacity. • grows quickly. • growth begins to slow down. • growth stops.

19. When the exponential phase of a logistic growth curve of a population ceases, • the size of the population drops. • the size of the population stays the same. • population growth begins to slow down. • population growth begins to speed up.

20. A biotic or an abiotic resource in the environment that causes population size to decrease is a • carrying capacity. • limiting nutrient. • limiting factor. • growth factor.

21. All of the following are limiting factors EXCEPT • immigration. • competition. • predation. • human disturbances.

22. Which of the following is NOT likely to be a limiting factor on the sea otter population? • disease • competition • drought • predation

23. Which will reduce competition within a species’ population? • fewer individuals • higher birthrate • fewer resources • higher population density

24. If a population grows larger than the carrying capacity of the environment, the • death rate may rise. • birthrate may rise. • death rate must fall. • birthrate must fall.

25. Water lilies do not grow in desert sand because water availability to these plants in a desert is • a limiting factor. • the carrying capacity. • a competition factor. • none of the above

26. A limiting nutrient is to ecosystem productivity as a limiting factor is to population • birthrate. • density. • growth rate. • immigration.

27. Each of the following is a density-dependent limiting factor EXCEPT • competition. • seasonal cycles. • crowding. • disease.

28. Which would be least likely to be affected by a density-dependent limiting factor? • a small, scattered population • a population with a high birthrate • a large, dense population • a population with a high immigration rate

29. Which of the following is a density-independent limiting factor? • earthquake • disease • emigration • parasitism

30. Which density-dependent factors other than the predator/prey relationship affected the populations of moose and wolves on Isle Royale? • extreme temperatures for the moose and flooding for the wolves • parasitic wasps for the wolves and clear-cut forest for the moose • a hurricane followed by drought for both moose and wolves • food availability for the moose and disease for the wolf

31. A disease resulting in the deaths of one third of a dense population of bats in a cave would be a • density-dependent limiting factor. • result of exponential growth. • density-independent limiting factor. • nutrient-limiting factor.

32. Which of the following would NOT be a limiting factor to the size of a large, dense population? • a struggle for food, water, space, or sunlight • predator/prey relationships • a struggle to find shelter from a natural disaster • parasitism and disease

33. Human population growth has slowed down in • China. • the United States. • India. • Africa.

34. Demography is the scientific study of • parasitism and disease. • modernized countries. • human populations. • none of the above

35. Demographic transition is change from high birthrates and high death rates to • exponential growth. • a low birthrate and a low death rate. • a low birthrate and a high death rate. • indefinite growth.

36. About 500 years ago, the world’s population started • decreasing. • to reach carrying capacity. • growing more rapidly. • to level off.

37. Countries in the first stage of demographic transition have • a low death rate and a high birthrate. • a high death rate and a low birthrate. • a slowly growing population. • more old people than young people.

38. Demographic transition begins with changes in society that • lower the birthrate. • increase the birthrate. • lower the death rate. • increase the death rate.

39. The human population experienced exponential growth after • agriculture began. • plowing and irrigation began. • the bubonic plague began. • the Industrial Revolution began.

40. Which country has not yet completed the demographic transition? • United States • India • Great Britain • Japan

41. The anticipated human population by the year 2050 is about • 7.8 billion. • 9 billion. • 9 trillion. • 78 billion.

42. In Rwanda, there are more young children than teenagers, and more teenagers than adults. This age structure indicates a population that • has stopped growing. • will double in 30 years. • has a steady growth rate. • will decrease in 30 years.

43. In countries like India, the human population is growing • exponentially. • transitionally. • logistically. • demographically.

44. Most of the worldwide human population is growing exponentially because • human populations have not reached their exponential curve. • human populations have not yet completed the demographic transition. • human populations do not conform to the logistic model. • science and technology have made it possible.

45. How can a diagram of a population’s age structure predict how it can grow? • It shows how many people are at reproductive ages. • It shows how many people will probably die within a few years. • It shows how many people are entering the population by birth. • all of the above

46. The number of individuals per unit area is a population’s growth rate. _________________________ • True • False

47. If the death rate of a population is greater than the birthrate, the population shrinks. _________________________ • True • False

48. There are about four million births per year in the United States. This statistic is a population dynamic called growth rate. _________________________ • True • False

49. Logistic growth occurs when a population’s growth slows or stops, following a period of rapid growth. _________________________ • True • False

50. Under conditions of logistic growth, population size will rise and fall around an average point called the carrying capacity. _________________________ • True • False