Ecology Test Review

Ecology is the study of the interactions between organisms and their interrelationships with the physical environment. Which of the following scientific questions would an Ecologist most likely investigate?

• Do all people's heights equal their arm span?

• How do higher salt concentrations affect cell function?

• What type of antibacterial soap will get rid of the most bacteria?

• What limiting factors may affect the carrying capacity of deer population in Georgia?

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Which statement is most likely true about the Reindeer population on St. Paul Island shown in the graph?

• It has exceeded its carrying capacity.

• It has reached equilibrium.

• It has plenty of resources.

• It has few resources.

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According to the graph, what is the approximate carrying capacity of the moth population?

• 320

• 250

• 220

• 200

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The diagram shown below represents a food web. If an insecticide is used to destroy most of the grasshoppers, what will most likely be the effect on the ecosystem?

• The population of birds will die out.

• Birds will avoid poisoned insects by preying on mice.

• The mice population will have more available food.

• Grasshoppers will multiply rapidly, providing more food for birds.

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According to the information in the food web, birds can be classified as

• carnivores

• carnivores

• omnivores

• producers

Who are the producers according to the information in the food web?

• carrots, grasses and grains

• foxes and owls

• carrots, grasshoppers and grains

• mice, grains and rabbits

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Which of the following is NOT true concerning the role of bacteria in the Nitrogen cycle?

• Bacteria perform nearly all the tasks in the Nitrogen cycle.

• Without bacteria, organisms will not have a useable form of Nitrogen for biological processes.

• Bacteria in the ground and lightning strikes are how atmospheric Nitrogen is fixed.

• Bacteria can be found in the atmosphere where 78% of Nitrogen is.

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Assume there are 3,000 Kcal of energy available in trophic level IV in the figure. According to the conventional energy flow model in ecosystems, which of the following statements correctly describes the energy flow in the system?

• Trophic level II generates a maximum of 30,000 Kcal of energy.

• Trophic level I has approximately 3,000,000 Kcal of available energy.

• Trophic level V has approximately 30 Kcal of available energy.

• Trophic level III has approximately 300 Kcal of available energy

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Use the diagram below to answer the following question. What would most likely be the predominant life form found in stage I?

• a producer like a fern

• consumer like a mouse

• a pioneer species like a lichen

• a decomposer like a mushroom

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Which of the following statements best describes the relationships the bacteria have with the humans?

• The relationship between the bacteria and the humans is predation.

• The relationship between the bacteria and the humans is mutualism.

• The relationship between the bacteria and the humans is parasitism.

• The relationship between the bacteria and the humans is commensalism.