Biology Review Ecology

Which of the following is a biotic factor that limits the carrying capacity of any habitat?

• the activity of decomposers

• the availability of water

• the level of atmospheric oxygen

• the availability of nutrients in soil

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 The graph below shows how a population changes over time.  Which of the following can be concluded based on the graph?

• The population decreased in size over time.

• The population grew rapidly without leveling off

• The population grew in size until it reached its carrying capacity.

• The population grew at the same rate after reaching its carrying capacity as it did before reaching its carrying capacity

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The illustration below shows a pond ecosystem. Which biotic factor would limit the carrying capacity of this pond for fish?

• temperature of water

• amount of sunlight reaching the pond

• the population of grasses growing on the pond’s banks

• the concentration of algae in the upper levels of the pond

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When an environment has reached its carrying capacity for a certain population, which of the following is true?

• Growth and immigration rate is equal to death and emigration rate.

• Growth and immigration rate is greater than death and emigration rate.

• Growth and immigration rate is less than death and emigration rate

• Growth rate is exponential.

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In which year did the population, in the graph below, reach its carrying capacity?

• year 1

• year 2

• year 4

• year 5

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The graph below shows a change in the number of deer on an island over time. Which event most likely occurred between month 1 and month 4?

• The rate of emigration increased

• The availability of resources decreased.

• The birth rate exceeded the death rate.

• The population exceeded carrying capacity.

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In the diagram, which of the following points represents the carrying capacity of the population?

• A

• B

• C

• D

Female leatherback sea turtles lay approximately 200 eggs in a nest each year. After hatching, the babies must dig out of the sand nest and travel across the beach to the water. Less than 1% of the hatchlings reach adulthood. What impact would a 10% increase in survival rate have on the populations of predators in the same environment?

• An increase in sea turtles would cause them to outcompete predators for resources.

• Predator populations would increase because the population of their prey increased

• Predator populations would decrease because the prey would be more likely to survive to adulthood.

• Predator populations would remain the same because a 10% increase in turtle maturation is not a substantial increase.

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Which of the following factors is least likely to affect the variety of organisms that live in a freshwater environment?

• mud depth

• oxygen levels

• water flow rate

• water temperature

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 The illustration below shows the zones in a lake environment.  What is the correct order of zones from greatest plant productivity to lowest productivity?

• Limnetic, Littoral, Benthic

• Littoral, Limnetic, Benthic

• Littoral, Benthic, Limnetic

• Benthic, Limnetic, Littoral

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