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Ecology Unit II Test - Retest
  • 1. Which of the following is an effect of drought that could lead to the extinction of a species of grazing animals?
A) Reduced prey populations
B) Decreased plant growth
C) Increased volcanic activity
D) Increased predator populations
  • 2. The Asian shore crab invaded parts of the eastern coast of the United States about 15 years ago. The Asian shore crab preys on blue mussels. In the time since the Asian shore crab arrived, the average shell thickness has increased in the blue mussel population.Which of the following is the most likely reason that this increase in shell thickness has occurred?
A) Blue mussels with thick shells grow in larger colonies than mussels without thick shells.
B) Blue mussels with thick shells attract more crabs than mussels without thick shells.
C) Blue mussels with thick shells catch more food per day than mussels without thick shells.
D) Blue mussels with thick shells survive and reproduce more successfully than mussels without thick shells.
  • 3. Fossils of tropical plants and animals can be found buried in limestone rock in the North Texas area. These plants and animals are no longer found in this region. What is the most likely cause of the disappearance of these tropical plants and animals?
A) Earthquakes and volcanoes destroyed all the tropical plants and animals.
B) Air pollution and acid rain killed off all the tropical plants and animals.
C) Tropical animals ate all the tropical plants and everything died out.
D) The climate in that area is different today than when tropical plants and animals lived there.
  • 4. A species of fish found in a coral reef exhibits variation in color. Lighter colored fish tend to blend in with their environment, whereas darker colored fish tend to stand out. Which of the following best describes how natural selection will affect this species of fish?
A) Only the darker variety of fish will survive.
B) Neither the lighter or darker varieties of fish will survive.
C) Both the lighter and the darkr fish will survive.
D) Only the lighter variety of fish will survive
  • 5. About 70 years ago, cane toads were introduced to Australia. The toads are toxic to some species of snakes, such as Dendrelaphis punctulatus. The longer an individual snake is, the greater its chance of survival after eating a cane toad.Which of the following did scientists most likely observe in the D. punctulatus snake population as a result of the presence of the cane toads?
A) The entire population became resistant to the toads.
B) The average body length in the population decreased.
C) The average body length in the population increased
D) The entire population was killed by the toads.
  • 6. Charles Darwin was best known in the 19th century for:
A) Creating the idea of evolution
B) Proving that the biggest and strongest animals are always at an advantage in natural selection.
C) Dividing the United States into two political parties
D) Building a ship for two of each animal
  • 7. Behavioral adaptations can be learned or are instinctive
A) True
B) False
  • 8. What causes a species to evolve?
A) An increasing number of children
B) A changing environment
C) Ability to have children
D) Inability to have children
  • 9. Which of the following is correct?
A) Closely related species do not have common ancestors
B) Natural Selection is a result of evolution
C) The living world always stays the same
D) Evolution is a rapid process
  • 10. The example of the peppered moths living near English industrial cities demonstrates that:
A) Evolution occurs so slowly that it is not possible to determine that it has happened in less than a million years
B) The environment near these cities has always favored dark colored moths
C) A change in an environment can result in the evolution of species living there
D) Natural Selection does not occur in cities
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