Changes in Ecosystem

Alligators are the large predators that eat many of the smaller animals in a swamp. How might removing the alligators from a swamp habitat create a decrease in vegetation?

• Plants would not be able to spread their seeds.

• More plant-eating animals would survive.

• Meat-eating animals would begin eating plants.

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In a study of the habitat of a population of raccoons, scientists found that the number of raccoons actually increased where people built houses. What might the scientists conclude from this observation?

• Raccoons lost their natural source of water

• The people brought many predators to the habitat

• Raccoons found more food living near people

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A highway is built through a forest. This will most likely have which of the following effects on the organisms in the are

• Raise the birth rate of animals on the forest floor

• Eliminate all species of plants found in the forest

• Make it difficult for animals to move through the forest

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During the construction of a mall, a lake was filled in. This would have the greatest negative effect on organisms that -

• live in water

• sleep in trees

• burrow in soil

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The ecosystem of some dairy cows includes the fields in which they graze, eating the grass they need. Too many cows can be harmful to their ecosystem because they could -

• produce too much milk

• raise the temperature

• remove all the vegetation

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If humans over-hunted a population of insect-eating birds, what immediate change would likely be seen in the area?

• Severe loss of vegetation

• Increased populations of insects

• Increased seedling germination

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If a factory polluted the water supply in an area, what change would likely be observed in that ecosystem?

• Local trees growing taller

• More birds nesting in trees

• Fewer pond plants and animals

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If humans cleared a forest and built homes where the forest once was, we would expect which of the following?

• Fewer tree-dwelling animals

• More frequent thunderstorms

• More development of soil

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