Relationships Among Species
Listen to part of a lecture in a biology class.
- What is the lecture mainly about?
- A. Ways species in an ecosystem affect each other’s population size
- B. How the carrying capacity of an ecosystem is determined
- C. A new theory regarding cycles in predator and prey population sizes
- D. How researchers monitor the population size of animal species in the wild
- Why does the professor mention nonnative species?
- A. To show that some species cannot be transplanted easily to new environments.
- B. To give an example of rapid population growth that is not followed by decline.
- C. To emphasize that species with rapidly growing populations harm ecosystem.
- D. To introduce a study on the changing population size of certain species.
- What point does the professor make when she discusses the carrying capacity of an ecosystem?
- A. The availability of food is more important for species than the availability of space.
- B. The amount of environmental resistance in an ecosystem does not change over time.
- C. Environmental resistance controls the population size of species in an ecosystem.
- D. The population size of most species increases at a constant rate.
- How did the researchers test the links between acorns, white-footed mice, and gypsy moths in a forest?
- A. They supplied an additional food source for gypsy moths.
- B. They introduced gypsy moths to areas where there had been none.
- C. They cleared oak trees from some areas where both animal species lived.
- D. They manipulated the numbers of mice and acorns in some areas.
- What does the professor say can lead to a change in the gypsy moth population in a forest?
[CHOOSE 2 ANSWERS]
- A. An increase in the number of tree species in a forest.
- B. An increase in the number of acorns produced by oak trees.
- C. A decrease in the population of white-footed mice.
- D. A decrease in oak tree leaves caused by gypsy moth caterpillars.
- What can be inferred about the professor when she says this: 🎧
- A. She does not know the answer to the student’s question.
- B. She wants to correct a statement she made earlier.
- C. She thinks the term the student used is incorrect.
- D. She would like to redirect the discussion.
B B C AD C D