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Free CLEP Science and Mathematics Exam Braindumps (page: 64)

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A small number of rabbits were brought to a farm in Victoria Australia in 1859. The rabbit population quickly exploded from a few to millions in a short period of time. In the 1950's a virus carried by mosquitoes, myxoma, was introduced.

This virus was initially lethal to 99.8% of the rabbit population exposed to it. Future outbreaks of the virus have not been as successful in reducing the rabbit population.

Which of the following statements is true about the rabbit population?

  1. Rabbits are able to reproduce faster than the death rate due to this virus.
  2. A genetic mutation occurred in the rabbit population that allowed the offspring to survive.
  3. Rabbits in regions without any mosquitoes spread to regions with the virus.
  4. Rabbits developed resistance to myxoma.
  5. Rabbits learned to avoid mosquito-infested regions.

Answer(s): D

Explanation:

Rabbits who had an immune system capable of combating the viral invader were able to survive and reproduce. Many of these genes were passed to the offspring. Over many generations the genes that allowed for resistance to this virus were selected for.



A small number of rabbits were brought to a farm in Victoria Australia in 1859. The rabbit population quickly exploded from a few to millions in a short period of time. In the 1950's a virus carried by mosquitoes, myxoma, was introduced.

This virus was initially lethal to 99.8% of the rabbit population exposed to it. Future outbreaks of the virus have not been as successful in reducing the rabbit population.

Which of the following statements is NOT true about the virus?

  1. The virus coevolves with the rabbit population.
  2. The virus does not undergo any evolutionary pressure.
  3. The virus evolves to become less virulent along with the rabbit population evolving to become more resistant.
  4. Less virulent strains of the virus become more prevalent in the virus population.
  5. The rabbit-myxoma system, without any outside pressures, will coevolve to reach a stable equilibrium.

Answer(s): B

Explanation:

The virus and rabbit populations both undergo an evolutionary process.



Which of the following is an example of coevolution?

  1. The evolution of reptiles and mammals
  2. The evolution of man
  3. The evolution of bacteria and viruses
  4. The evolution of sponges
  5. Birds consuming the fruit of plants and distributing the seeds

Answer(s): E

Explanation:

Many fruit-eating birds coevolve with the plants whose fruits they eat. The birds get nourishment, and in the process the plants get their digestion-resistant seeds dispersed along with the birds' droppings.



Which of the following is an example of a primary producer?

  1. Lion
  2. Deer
  3. Cyanobacteria
  4. Viruses
  5. Plankton

Answer(s): E

Explanation:

Primary producers are the first step in the food chain. These are plants that utilize sunlight to produce sugar via photosynthesis.






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