Practice Quiz 1

1. A population of organisms will only grow exponentially if _____

• A.

  resources are unlimited.

• B.

  they emigrate often.

• C.

  resources are limited

• D.

  they do not compete

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2. What will most likely occur if two different plant species compete for the same requirements in an ecosystem?

•  

  A. They will usually develop different requirements

•  

  B. One species may adapt to a different environment

• C. One species may be eliminated from that ecosystem

• D. They will alter the environment so that they can both survive in that ecosystem

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Which graph represents a population that grew and is maintained at the carrying capacity of its ecosystem?

• 1

• 2

• 3

• 4

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The Loch Raven Reservoir supports a variety of organisms at all times of the year. There is an algal bloom this year. How would the environment be expected to change?

• A. The population numbers of the species in the reservoir would remain at the carrying capacity. 

• B. The population numbers of the species in the reservoir would decrease along with the carrying capacity. 

• C. The population numbers of the species in the reservoir would increase along with the carrying capacity.

• D. The population numbers of the species in the reservoir would increase and the carrying capacity would decrease.

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Population growth can be calculated by using the following formula: 

 

Population Growth = (Births + Immigration) - (Deaths + Emigration)

 

Calculate the population growth for the following scenario. Over the course of a year, a population of 25 penguins gained 5 penguins through births and lost 3 penguins to death.  In addition, 10 adult penguins moved into the population through immigration and 6 adult penguins moved out of the population through emigration.  What is the yearly growth rate of this population?

• 19

• -2

• -8

• 6

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Dissolved oxygen levels in water sources are dependent on several factors, including temperature and concentration of plant and animal species. Which environment would most likely have the highest level of dissolved oxygen?

• A. A warm environment in which aquatic animal populations are low, and plant growth is high

• B. A warm environment in which aquatic animal populations are high, and plant growth is low

• C. A cool environment in which aquatic animal populations are low, and plant growth is high

• D. A cool environment in which aquatic animal populations are high, and plant growth is low

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The turbidity of water is used to measure its 

• (A) pH

• (B) Clarity

• (C) Nitrate concentration

• (D) Biodiversity 

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Turbidity measures clarity of the water. This data can tell us  

• (A) If plants at the bottom are getting sunlight

• (B) If many small organisms are being consumed

• (C) The cause of the changes in the water

• (D) The cause of fish deaths in the water 

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