Ecology

Which of these is not a characteristic of a population?

• growth rate
• population density
• spatial distribution
• climate

The number of organisms per unit of area is called ____.

• population density
• growth rate
• density factor
• random spacing

What environmental factors are not dependent on numbers of organisms per unit of area?

• spatial factors
• density-dependent factors
• density-independent factors
• population factors

What term describes individuals moving away from a population?

• immigration
• emigration
• exponential growth
• logistic movement

How do severe crown fires and less severe ground fires affect the environment differently?

• Ground fire does not alter ecosystem.
• Crown damage fire can benefit trees.
• Ground fires can benefit trees.
• Crown damage fire will not limit population growth.

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Why is disease considered a density-dependent environmental factor?

• Disease spreads easily in a low density population.
• Population density affects amount of contact.
• Disease won't spread in high density populations.
• Disease may be influenced by weather.

What can be concluded about the relationship between wolves and moose, based on this graph?

• Wolves prey on moose.
• Moose pray on wolves.
• Wolves and moose do not influence one another.
• Wolves and moose cannot live in the same community.

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Why don't mice in the wild reproduce at the rate shown in this graph?

• There are no limiting factors present.
• Resources are unlimited.
• Resources increase as the population increases.
• Limiting factors are present.

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Which of these is not studied in demography?

• birth rate
• population size
• climate
• distribution

A significant decrease in birth and death rates is called a (an) ____.

• rate alteration
• demographic transition
• age structure
• growth trend