7.4.3 - Human Impact on Ecosystems

Which of the following would be considered good evidence that the over-exploitation of resources in an environment harms organisms living in that environment?

• When people cut down and log trees in a forest, many species of animals lose their habitats.

• Mining a mountain top for coal results in cheaper electricity for consumers in urban areas.

• Water levels in a reservoir go down when water evaporates from the surface.

• Large solar energy panels in the desert don't work well when they get covered in sand and dust.

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Which factor has been the main cause of many species becoming endangered or extinct?

• loss of habitat

• oil spills

• hunting

• global warming

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Identify which is not a cause of species endangerment.

• habitat destruction

• hunting

• reforestation

• pollution

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Which of the following practices would result in the loss of biodiversity in an ecosystem?

• clearing a forest and building a housing development

• allowing a small forest fire to burn after lightning strikes

• walking through a forest to identify all of the tree species

• hunting deer in a forest during hunting season

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What happens if humans use a large amount of a resource, such as oil, in a relatively short period of time?

• The Earth produces more of the resource very rapidly.

• Humans produce more of the resource very rapidly.

• The resource can become scarce or disappear altogether.

• Nothing happens because all resources are in infinite supply.

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In some countries today, people have cut down rainforests in order to have wood for heating and cooking. Which statement describes the greatest immediate negative impact of this deforestation?

• The ozone layer will be damaged.

• Acid rain will increase.

• Animals and plants will lose their habitats.

• The amount of oxygen in the air will dramatically decrease.

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In a region, human population increases at a very high rate resulting in increased human activities that lead to deforestation and setting up of industries.

What impact will this high rate of increasing population have on the ecosystem?

• increase toxic waste in soil and air

• limit the carbon dioxide in the atmosphere

• limit the energy consumption by population

• increase native species population in ecosystem

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Farming damages an ecosystem by all of the following except ______.

• the use of pesticides, fertilizers, and herbicides

• building the health and enrichment of the soil

• attracting insects and animals that feed on the crops

• introducing non-native plants into the habitat

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Which of the following human actions most effectively prevents water pollution?

• conserving wetlands and forests

• requiring stricter regulations of corporate chemical waste

• driving hybrid cars

• ground truthing

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How did the Endangered Species Act affect species of animals such as the American alligator and the American bald eagle?

• It required that animals near extinction be raised in zoos.

• It required that paintings and sculptures be made of all extinct species.

• It required protection for animals that are near extinction.

• It required appropriate hunting fees for animals that are near extinction.

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