Unit 1.1 Ecology Review Bio H

Which statement best explains the section of the graph labeled X?

• Interbreeding is occurring between members of different species.

• The wildebeest population has reached its carrying capacity.

• The wildebeest are no longer in competition for resources with other species.

• Predation is low and resources are high.

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An isolated bird population on a remote island remains at a relatively constant size year after year.

Which of the following most likely describes the birthrate and the death rate for this population?

• Birthrate and death rate are both 100.

• Birthrate and death rate are close to equal.

• Birthrate is significantly lower than death rate.

• Birthrate and death rate do not affect population size.

Based on the data, which of the following statements best describes an effect of population density on mice populations?

• Birthrate decreases as population density increases.

• The female to male ratio increases as population density decreases.

• Successful breedings decrease as population density decreases.

• Death rate decreases as population density increases.

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What is best represented by the letter X?

• Carrying capacity

• The average life span of the species

• Biodiversity level of the habitat

• Extinction

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A population of frogs in a pond is growing under natural conditions with limited resources.

As the frog population increases in size, how will population density affect its growth rate?

• Population density will remain constant and population growth will increase.

• Population density will become unstable and population growth will stop.

• Population density will decrease and population growth will eventually increase.

• Population density will increase and the rate of population growth will eventually slow.

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NGSS.MS-LS2-1

Changes in a population of wolves are shown in the table above.

What is the most likely explanation for why the size of the wolf population remained relatively constant from 1990-1992?

• The population suffered from a new disease.

• The wolves' prey source was killed off due to hunting.

• The population reached its carrying capacity.

• A new predator was introduced.

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The population living at its biotic potential is located at which graph?

• A

• B

• C

• D

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A population showing logistic growth is shown in which graph?

• A

• B

• C

• D

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The section of the graph showing the fastest rate of growth is at...

• a

• b

• c

• d

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What might be causing the growth of this population to slow?

• Density-dependent factors

• competition for limiting resources

• predation

• all of the above

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