Population Ecology II

What is the best definition of a population?

• The number of plants and animals there are in an area
• The number of different species in one place at one time
• The number of individuals of one species living in the same place
• The total number of all organisms in an ecosystem

Which of the following is likely to cause an increase in birth rate?

• water shortage
• low rainfall
• increased food supply
• more predators

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Organisms trying to obtain the same resources is called

• competition
• predation
• adaptation
• imigration

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In the predator prey graph shown here, what causes the rise in the prey numbers?

• Decrease in prey
• Increase in predators
• Decrease in predators
• Lack of competition

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During deer rutting season, male deer will fight for the chance to mate with the females in the herd. This is an example of

• predation
• saprophytism
• cooperation
• competition

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Rushes are plants which grow very successfully in wet soils. This means that

• they will compete with sundew plants which also grow in wet soil
• they have no adaptations
• they will become a problem species in well drained fields
• they prefer bright sunshine

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Groups of different species living in the same area at the same time

• ecosystems
• biosphere
• communities
• populations

Carrying capacity....

• the maximum population growth rate under ideal conditions

• the change in the population size per individual per unit time.

• the maximum population size that can be supported by an ecosystem.

• the members of a species that live in an ecosystem and have the potential to reproduce.

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Predation, disease and competition are examples of ………………………factors.

• density-independent

• dispersal

• survivorship

• density-dependent

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The average number of individuals of the same species per unit of surface area at a given time is the ……………………

• population density

• population growth

• population birth rate

• population size