Environmental Changes

Crested floating heart is a non-native plant that now grows in Texas. This plant grows very fast and can spread over the entire surface of a pond or lake. Which effect will most likely occur when crested floating heart covers a lake?

• Small fish will have fewer places to hide from predators.

• Less sunlight will reach the plants that grow underwater.

• Several new trees will grow along the lake shore.

• Deer will have to find another source of water.

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An organism is a living thing.

• True

• False

Living organisms, including humans, can change their environment.

• True

• False

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Over the past century, human actions have greatly reduced the area covered by wetlands in the United States. How does the loss of wetlands influence ecosystem?

• It increases the number of species.

• It helps preserve the quality of water.

• It reduces the risk of erosion.

• It decreases the number of different species.

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Fertilizer from a farm field washes into a pond. The extra nutrients in the water cause a lot of algae to grow. The algae form a thick mat that covers the pond surface. This is called an algal bloom. What organisms in the pond might decline in numbers when this occurs?

• ducks that eat algae on the surface of the pond

• underwater plants that need sunlight to grow

• snails that eat dead algae at the bottom of the pond

• none of the above

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When a change occurs, organisms will-

• only adapt

• adapt, migrate, or die

• only migrate

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How would building a highway affect an environment?

• salt water pollutes fresh water

• marine life is threatened

• animals cannot travel through their ecosystem the same

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Which would most likely be caused by a decrease in a population of herbivores?

• an increase in the number of producers

• a decrease in the types of decomposers

• an increase in the number of carnivores

• an increase in the types of plants

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To forecast the result or take an educated guess at the effects of one thing on another-

• ecosystem

• overpopulation

• predict

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If a coyote disease decreases the coyote population, then-

• the pond floods

• grasshoppers die out

• the mice population explodes

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