North American Wood Frog
Listen to part of a lecture in a biology class.
- What is the main purpose of the lecture?
- A. To explain the biological advantages of a physical change that occurs in North American wood frogs.
- B. To explain why the North American wood frog’s habitat range has expanded.
- C. To describe the functioning of the circulatory system of the North American wood frog.
- D. To introduce students to an unusual phenomenon affecting North American wood frogs.
- Why does the professor first mention the arrival of spring?
- A. To encourage students to look for thawing wood frogs.
- B. To point out the time period when frogs begin mating.
- C. To explain why the class will soon be doing experiments with wood frogs.
- D. To emphasize the speed of the thawing process.
- What happens to a wood frog as it begins to freeze?
- A. Blood is concentrated in the center of its body.
- B. Blood stops producing sugar.
- C. Water moves out of its internal organs.
- D. Water from just beneath the skin begins to evaporate.
- What are two points the professor makes about the thawing process of the wood frog?
[CHOOSE 2 ANSWERS]
- A. The thawing process is not fully understood.
- B. The thawing process takes longer than the freezing process.
- C. The frog’s internal organs thaw before its outer skin thaws.
- D. Thawing occurs when the frog’s heart begins pumping glucose through its body.
- What impact does freezing have on some thawed wood frogs?
- A. It increases their reproductive success.
- B. It decreases their life span.
- C. It causes them to be more vocal and active.
- D. It reduces their ability to recognize potential mates.
- What does the professor imply when she says this: 🎧
- A. She wants the student to clarify his question.
- B. She wants the student to draw his own conclusions.
- C. She thinks the student does not understand how car antifreeze works.
- D. She thinks the student has misunderstood her point.
D A C AC D B