Population Dynamics and Limiting factors Review

1. The graph shows the population of an organism that was introduced to a new environment and how the population changed over 35 years. After the sharp rise, there was a leveling off in the population. What does this indicate?

• 1. The life expectancy of the organisms in this population is about 15 years. 

• 1. This organism needs 15 years to reach maturity before it can reproduce. 

• 1. This species is unable to reproduce in any habitat beyond a population of around 60 individuals. 

• 1. This environment has the carrying capacity to support 60 individuals of this organism.

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How would the deaths of many individual organisms due to a natural disaster or catastrophic event (such as a fire, tornado, or flood) affect a population of animals? 

• 1. Biodiversity in the population would increase. 

• 1. The population size would remain the same. 

• 1. The number of new births would equal the number of deaths. 

• 1. The population size would decrease. 

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A population of fish in a lake has reached its carrying capacity. What will most likely happen if more fish are introduced into the lake?

• 1. The lake will expand to hold more fish.. 

• . The fish population will continue to grow rapidly.

• 1. Competition for food and space will increase.. 

• The birth rate will increase to balance the population.

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Which factor directly reduces a population through emigration?

• A flood forces animals to move to a new area.

• . A disease spreads among the population.

• Food availability increases.
  
  

• The birth rate exceeds the death rate.

A scientist observes that a rabbit population in a grassland has grown rapidly for several years but then remains stable. What best explains this pattern?

• The rabbits stopped reproducing.
  
  

• The population reached its carrying capacity.
  
  

• . The rabbits migrated to other grasslands.
  
  

• Predators were eliminated from the ecosystem.

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Which situation would cause a population of lizards to increase in size?

• Death rate is higher than birth rate

• Emigration is greater than immigration.

• . Immigration is greater than emigration

• Birth rate equals death rate.

In a population of elk, the birth rate is higher than the death rate. What will most likely happen to the population?

• It will decrease.
  
  

• . It will remain the same.
  
  

• It will increase.
  
  

• It will reach zero growth.

A population of insects grows rapidly and then levels off. Which factor best explains why the population leveled off?

• . Increased space became available

• . Resources became limited

• . Immigration increased dramatically

• Birth rates decreased to zero.

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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.

Angel was trying to explain carrying capacity to her mother. Which of the following descriptions is accurate? Carrying capacity is :

• the maximum number of individuals that an ecosystem can sustain.

• the ability of an environment to accommodate a growing population.

• the maximum number of species that can co-exist in an area.