环境科学 TPO52-L2 Interactions within an Ecosystem

环境科学

TPO52-L2 Interactions within an Ecosystem


Listen to part of a lecture in an environmental science class.



  1. What is the lecture mainly about?
  • A. A new approach to ensuring the survival of a forest ecosystem
  • B. Similarities between desert and forest-stream ecosystems
  • C. Interactions that take place within a North American forest ecosystem
  • D. Factors that have contributed to the preservation of salmon populations in forest ecosystems

 

  1. Why does the professor mention ants and rodents competing for food?
  • A. To make sure the students understand the different components of an ecosystem
  • B. To point out the limited resources available to organisms in a desert ecosystem
  • C. To illustrate how different species adapt to extreme temperatures
  • D. To provide an example of an easily understood interaction within an ecosystem

 

  1. According to the professor, how do trees contribute to the successful spawning of salmon?
    [CHOOSE 2 ANSWERS]
  • A. They provide streams with nutrients that the salmon need.
  • B. They provide shade that keeps streams sufficiently cool.
  • C. They help salmon avoid predators by providing camouflage.
  • D. They reduce the amount of sediment entering streambeds.

 

  1. What point does the professor make about bears carrying salmon away from streams?
  • A. It results in bears eating fewer fish.
  • B. It reduces the amount of food available to scavengers.
  • C. It improves the health of the surrounding trees.
  • D. It improves the water quality of the streams.

 

  1. What does the professor imply about overfishing?
  • A. It is one of several reasons that the bear population has declined.
  • B. It is difficult to prevent in both oceans and streams.
  • C. It cannot be the sole focus for those working to prevent salmon depletion.
  • D. Its impact is minor compared to the problems caused by logging.

 

  1. Why does one of the students say this: 🎧
  • A. To provide support for a hypothesis mentioned by the professor
  • B. To suggest that a bear behavior mentioned by the professor seems improbable
  • C. To explain why confrontations take place between bears
  • D. To explain why bears eat so much in a short time span


答案:
C D BD C C B

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