5.9C Changes to Ecosystems 1

All of the following are examples of ways humans can decrease their effect on local ecosystems except –

• recycle instead of throwing items in the garbage

• drive larger cars

• collect rainwater to water gardens

• use reusable grocery bags instead of plastic bags

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Deforestation is the destruction of forests in order to make the land available for other uses. Which of the following is one negative impact of deforestation?

• There is more room for farming and agriculture.

• There is more lumber available for building homes and other buildings.

• Animals lose their homes and many species die off or become endangered.

• Ranchers have more land for livestock such as cattle and sheep.

  
  

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What is an invasive species?

• Living organism that is accidentally introduced to a new ecosystem and causes harm

• A group of organisms that hunts other organisms

• An unhealthy organism that spreads disease in an ecosystem

• All of the above

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Which of the following human activities does NOT have a negative impact on the environment?

• Burning large amounts of fossil fuels

• Increased use and production of plastic

• Overfishing in oceans and other waters

• Creation of green spaces and open spaces in cities

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What is biodiversity?

• A record of all the endangered and threatened species on Earth

• The variety of species of living organisms in an ecosystem

• A record of all extinct species in Earth’s history

• The variety of plant species in an ecosystem

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Approximately how long does it take for a plastic bottle to decompose in a landfill?

• A few days

• A few years

• A few months

• A few centuries

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The Leatherback Sea Turtle has been listed as an endangered species since 1970. It lives in the Gulf of Mexico, although it rarely visits the Texas coast. Populations have decreased due to human activities. Which of the following is most likely a consequence of the decreasing turtle population?

• The population of sea grasses, part of their diet, will decrease.

• The population of predators that eat sea turtles and their eggs will increase.

• The population of jellyfish, their main diet, will increase.

  
  

• There are no consequences; sea turtles are not an important part of the marine ecosystem.

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Overgrazing occurs when animals, often livestock, are allowed to feed in one area for an extended period of time. Which of the following is a negative impact of overgrazing?

• Pollution and global warming

• Erosion of soil, loss of biodiversity and desertification of the land

• Destruction of forests

• Introduction of new species to an area

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