Listen to part of a lecture in a biology class.
- What is the main purpose of the lecture?
- A. To explain why a species of warbler might become extinct.
- B. To discuss the evidence that led Gause to formulate his hypothesis.
- C. To examine a hypothesis about what happens when species compete.
- D. To identify factors that allow some species to dominate others.
- According to Gause’s hypothesis, what happens when two similar species compete for limited resources in the same habitat?
- A. Both species will develop new nutritional requirements.
- B. Both species will change their behaviors.
- C. One of the species will eliminate the other from the habitat.
- D. One of the species will spread into a new habitat.
- How do the five species of warbler described by the professor manage to coexist?
[CHOOSE 2 ANSWERS]
- A. By using different materials to build their nests.
- B. By feeding in different sections of the tree.
- C. By eating different kinds of insects.
- D. By breeding at different times of the year
- What is the professor’s opinion about Gause’s hypothesis?
- A. She thinks that it has not been disproved.
- B. She thinks it is contradicted by basic laboratory experiments.
- C. She thinks that it cannot be adequately investigated.
- D. She believes that it is contradicted by the competitive exclusion principle.
- What does the professor imply about the relationship between an organism’s niche and its habitat?
- A. An organism’s niche is exactly the same as its habitat.
- B. An organism’s niche is only partly defined by its habitat.
- C. An organism’s habitat is almost always more complex than its niche.
- D. An organism can change its habitat but cannot change its niche.
- Why does the professor says this: 🎧
- A. To encourage other students to participate in the discussion.
- B. To correct an error in the student’s statement.
- C. To encourage the student to answer more specifically.
- D. To confirm that the student’s answer is correct.
C C BD A B D