Ecosystem Dynamics and Human Activity

Eutrophication is

• too few nutrients in a body of water.

• too many nutrients in a body of water.

• high acid levels in a body of water.

• high alkalinity levels in a body of water.

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Nutrients cause what effect in our creeks and rivers?

• limestone to disappear.

• dissolved Oxygen levels to rise.

• algae to grow more rapidly.

• bacteria populations to decrease.

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When nutrient levels rise to high levels in a body of water, the effect on dissolved Oxygen levels is...

• decreases.

• increases.

• does not change.

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How does eutrophication cause the death of aquatic organisms?

• the build up of carbon dioxide in the water

• the lack of nitrogen in the water

• the lack of carbon dioxide in the water

• the lack of oxygen in the water

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Human activities such as deforestation, transportation, and industry are causing…

• Increased biodiversity in many ecosystems

• Increased carbon dioxide levels in the atmosphere

• more resilient ecosystems

• the skies to be more majestic featuring smoke rings and smoke pillows

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A company has purchased 15,000 acres of forest. The loggers harvest mature trees in order to supply lumber for new homes. According to the graph, the Spotted Owl and the Hawk populations are the most negatively affected organisms. What would be the most likely explanation of why this has occurred?

• The Owl and Hawk numbers have dropped because the logging has depleted their food source.

• The owl and hawk populations have dropped because of the pollution from the logging equipment.

• The owl and hawk populations have dropped because the logging has removed the places they used for their nests.

• The owl and hawk populations have dropped because they have been scared away by the presence of humans.

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Which effect would most likely occur if a six-lane highway were built through an ecosystem?

• Competition for resources would be reduced

• Habitats available to animals would be reduced

• Air pollution would decrease.

• Water pollution would decrease

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Which of the following would most likely result in a decrease in the population of insect-eating birds that build their nests in trees?

• A. Overhunting of animals that prey on birds

• B. Observation of the birds by scientists

• C. Introduction of a new type of insect

• D. Clearing of forests to build a highway

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There are many large-mouth bass, a type of fish, living in a small lake near Waco, Texas. How would increased fishing in the lake effect the lake ecosystem?

• Predators of the bass might starve due to loss of a food source

• The population of the bass’ prey would decrease.

• The bass would spend more time swimming near the surface

• Water level in the lake would decrease as more fishing took place

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What is a negative consequence of overgrazing?

• vegetation or grass is damaged and the ground can no longer be used for feeding or agriculture.

• your animals cannot graze for one day

• your animals get sick

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