Environmental Changes

Test Description: 5.9C

Instructions: Answer all questions to get your test result.

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

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

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

4) Humans brought the first pigs to Hawaii more than 1,000 years ago. The pigs have no predators and eat nearly anything. Which of the following is a negative impact that might result from the introduction of pigs to the Hawaiian rainforest ecosystem?

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

6) An Oregon truffle is a type of fungus that grows underground in moist soil near fir trees and reproduces using spores instead of seeds. Which of the following environmental changes would likely cause a decrease in the truffle population in an area?

7) 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?

8) 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 -

9) How could beavers building a dam cause an increase in fish population? The dam -

10) 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?

11) European rabbits were released into the Australian wild in 1859. They had no predators and found plenty of grasses, roots, fruit and seeds to eat. Rabbits likely impacted the Australian ecosystem in all of the following ways EXCEPT –

12) 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?

13) The surroundings where organisms live

14) Things that happen as a result of an action

15) Living thing

16) Tell or guess in advance

17) To cause to become or to make different


*select an answer for all questions

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