Question

31. Which of the following is NOT an anti-predator defense mechanism?

A. Plant chemicals, including coffee and tea caffeine, make caterpillars sick or jittery.

B. The large eyespots on a moth's wing are exposed abruptly to startle a hungry bird.

C. Many trees, vines, and shrubs have stems lines with long thorns.

D. Many plants have brightly colored fruit and flowers.

32. An intimate relationship between two different species is called

A. competition. ​B. a community. ​​C. an ecosystem.​D. symbiosis.

33. Which statement about parasitism is true?

A. The host is generally smaller than the parasite.

B. Parasites are always severe and kill the host.

C. All parasites require a single host ​

D. There are examples of parasites in every kingdom of life.

34. Parasites are found

A. only as viruses, bacteria, and protists. ​B. only as viruses, bacteria, protists, and animals

C. only on host animals. ​D. in all kingdoms, sometimes a parasite uses more than one host

35. A form of symbiosis in which one participant benefits and the other apparently is not benefited nor harmed is

A. commensalism. ​B. parasitism.​​C. mutualism.​​D. coevolution.

36. A small marine amphipod has recently been discovered that carries another organism on its back. The "backpack" organism tastes bad. If a fish ingests the pair, it immediately spits them back out. If the amphipod is alone, however, it is readily eaten and swallowed. There is no apparent benefit in this relationship for the "backpack" organism, which appears to be neither helped nor harmed. This is therefore a case of

A. mutualism. ​​B. parasitism. ​​C. commensalism.​D. competitive exclusion.

37. An example of commensalism is

A. mycorrhizal fungal roots on the roots of plants. B. ants living on the bullhorn acacia tree.

C. termites with protozoa in their digestive tracts. D. clown fishes in sea anemones.

38. A form of symbiosis in which both participants benefit is

A. commensalism. ​B. parasitism.​​C. mutualism.​​D. predation.

3.9 The role a species plays in the community is called its

A. habitat. ​​B. ecological niche. ​C. biotic role. ​​D. abiotic role.

40. All the members of the same species that inhabit a particular area are termed a(n)

A. ecosystem. ​​B. biosphere. ​​C. niche.​​D. population.​ .

41. Which of the following would allow optimal population growth?

A. accumulation of waste products ​B. predation

C. competition ​​​​D. unlimited resources

42. A scientist observes a population of grasshoppers in a farmer's field several times over the summer. She notices that after each application of an insecticide the grasshopper population increases to its pre-pesticide levels very rapidly. This finding indicate the grasshopper population is

A. in the lag phase. ​​​B. in the exponential growth phase.

C. in the deceleration phase. ​​D. in the stable equilibrium phase.

43. When growth proceeds at a rate similar to 2 ® 4 ® 8 ® 16 ® 32 ® 64...etc., it is called

A. arithmetic growth. ​B. additive growth. ​C. exponential growth.​D. zero growth.

44. Population size is believed to level off at the _______ of an environment.

A. population growth ​B. biotic potential​C. resistance​​D. carrying capacity

45. The maximum population that the environment can support for an indefinite period of time is

A. biotic potential. ​B. environment. ​C. carrying capacity. ​D. replacement

46. Which is NOT a density-dependent factor?

A. food supply ​​B. weather​​C. shelter or nest space​ D. disease

747. The outbreak of a disease, as bubonic plague, that kills many people is an example of factor

A. density-independent B. density-dependent​ C. a commensalistic ​D. a symbiosis.

48. A number of populations of different species interacting with one another is called

A. competition. ​B. a community. ​C. an ecosystem.​D. predation.

49. A number of populations of different species interacting with one another in a natural environment, such as a rotten log, is called

A. competition. ​B. a community.​C. a biome. ​​D. predation.

50. The ____ is made of a community of organisms, plus its physical environment.

A. food chain ​​B. habitat​​C. niche​​D. ecosystem

51. An ecosystem contains

A. only the biotic (living) components of the environment. ​

B. only abiotic components ​​​C. only energy flow

D. both the living organisms and the abiotic components of the environment.

52. An ecosystem consists of what two components?

A. grazing and detritus food chains ​B. habitat and niches

C. biotic & abiotic ​​​D. light and water

53. Which of the following is an example of the importance of biodiversity in a natural ecosystem?

A. pollination of flowers by bees ​B. production of antibiotics from fungi

C. increasing the survival rate of childhood leukemia from 10 percent to 90 percent

D. increasing the availability of food for the human population

54. Introduction of alien or exotic species into new ecosystems does NOT occur by

A. colonization when new settlers arrive in an area.

B. accidental transport by ship or plane without anyone's knowledge.

C. introduction as new agriculture by settlers.​D. expansion of the new species itself.

55. The loss of a keystone species would lead to

A. a great number of secondary extinctions.​B. increase in species diversity.

C. an increase in the population of other keystone species. D. immediate collapse of the community.

E. no noticeable change in the biodiversity of the community.

56. Which factor will have the greatest impact in determining the type of biome in a location?

A. temperature ​B. soil conditions​C. rainfall ​​D. wind patterns

57. The largest biome on Earth is the

A. tundra. ​​B. taiga.​​C. deciduous forest​D. ocean.

58. As the latitude increases, which biome sequence would be present?

A. tundra, coniferous forest, deciduous forest, tropical forest

B. tundra, deciduous forest, coniferous forest, tropical forest

C. tropical forest, deciduous forest, coniferous forest, tundra

D. tropical forest, coniferous forest, deciduous forest, tundra

59. Which would be characterized by little rainfall, permafrost, and reindeer?

A. grasslands ​​B. deciduous forest​C. desert ​​D. tundra

60. A treeless region with little rainfall in the far north is the

A. grassland. ​​B. tundra. ​​C. taiga. ​​D. chaparral.​

Answer 1