Ecology Unit Review

What do you call organisms that eat ONLY producers?

• Herbivores

• Carnivores

• Omnivores

• Saprophytes

Which group would have the greatest amount of stored energy?

• Weasels

• Spiders

• Seeds

• Red Foxes

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Which population in this food web would most likely be negatively affected by an increase in the mouse population?

• snake

• rabbit

• wolf

• hawk

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Which of the following best describes an ecosystem?

• A community of people and their pets

• A collection of various species of plants and animals

• An interaction between living organisms and their environment

• A large area of land with similar weather patterns

Decomposers are important in the environment because they

• convert large molecules into simpler molecules that can then be recycled

• release heat from large molecules so that the heat can be recycled through the ecosystem

• can take in carbon dioxide and convert it into oxygen

• convert molecules of dead organisms into permanent biotic parts of an ecosystem

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A new island formed by volcanic action may eventually become populated with biotic communities as a result of

• a decrease in the amount of organic material present

• decreased levels of carbon dioxide in the area

• the lack of abiotic factors in the area

• the process of ecological succession

The size of a mouse population in a natural ecosystem tends to remain relatively constant due to

• the carrying capacity of the environment

• the lack of natural predators

• cycling of energy

• increased numbers of decomposers

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The graph below indicates the size of a fish population over a period of time. The section of the graph labeled A represents

• biodiversity within the species

• nutritional relationships of the species

• a population becoming extinct

• a population at equilibrium

The graph below shows the growth of two populations of paramecia grown in the same culture dish for 14 days. Which ecological concept is best represented by the graph?

• recycling

• equilibrium

• competition

• decomposition

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Which statement best describes bat populations in a stable ecosystem?

• They are held in check by environmental  factors.

• They are producers that rely indirectly on other producers.

• They are not limited by natural predators.

• They are not dependent on other species.

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