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Free CLEP Science and Mathematics Exam Braindumps (page: 65)

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Which of the following statements is true about a community that has a high diversity (large number of species)?

  1. It is less complex and more stable than a community with low diversity
  2. It is less complex and less stable than a community with low diversity
  3. It is more complex and less stable than a community with low diversity
  4. It has the same complexity and stability as a community with low diversity
  5. It is more complex and more stable than a community with low diversity

Answer(s): E

Explanation:

Communities with high levels of diversity are more stable and complex. The increased diversity typically allows these communities to better cope with changes in environmental factors.



Which of the following is NOT an abiotic factor in the environment?

  1. Sunlight
  2. Temperature
  3. Rain
  4. Vegetation
  5. Minerals

Answer(s): D

Explanation:

Abiotic factors are non-living factors. Vegetation is living.



Which type of organism comprises the largest amount of biomass in the energy pyramid?

  1. Decomposers
  2. Primary consumers
  3. Third-level consumers
  4. Producers
  5. Secondary consumers

Answer(s): D

Explanation:

Producers are at the base of the energy pyramid. These producers consist of predominantly green plants that harness the energy from the sun to fuel the process of photosynthesis, which converts carbon dioxide and water into sugar.



Which of the following is an example of a human activity that has decreased biodiversity?

  1. Genetic modification of food
  2. Irradiation of food
  3. Crossing a plum and an apricot to create a pluot
  4. Planting a few types of wheat that compose 90% of the harvest
  5. Use of pesticides for pest control

Answer(s): D

Explanation:

Genetic diversity is related to the number of genes in the gene pool. When only a few types are planted, their genes are overly represented in the gene pool and genetic diversity is decreased.






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