Delta Test 2 Listening 1 Q 6-11

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Question 1 of 6

1. Question
6. What is the main purpose of the lecture?
- A. To describe the process of photosynthesis
- B. To explain how the carbon cycle works
- C. To link carbon and global warming
- D. To compare carbon dioxide and energy
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Question 2 of 6

2. Question
7. What point does the professor make about the cycling of carbon dioxide in the atmosphere?
- A. It is disrupted when animals eat the leaves of trees.
- B. It provides a link between Earth’s atmosphere and outer space.
- C. It occurs globally through the respiration of plants and animals.
- D. It is a subject of disagreement among scientists.
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Question 3 of 6

3. Question
8. Listen again to part of the lecture. Then answer the question.

Why does the professor say this:
- A. To show that environmental conditions have changed over time
- B. To explain how carbon can be removed from the cycle for long periods
- C. To point out that coal and petroleum are the oldest organic substances
- D. To compare the carbon content of coal with that of petroleum
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Question 4 of 6

4. Question
9. According to the professor, what factors affect the amount of carbon dioxide in the atmosphere? Click on 2 answers.
- A. The season of year
- B. The species of vegetation
- C. The burning of fossil fuels
- D. The amount of precipitation
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Question 5 of 6

5. Question
10. According to the professor, why is the level of atmospheric carbon dioxide lowest during the summer?
- A. Carbon separates from oxygen in warm temperatures.
- B. Respiration by animals exceeds respiration by plants.
- C. Plant–eating animals eat less during the summer.
- D. Plants use more carbon dioxide for photosynthesis.
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Question 6 of 6

6. Question
11. What does the professor mean when she says this:
- A. There is disagreement over the effects of changes to the carbon cycle.
- B. Tomorrow the class will participate in a scientific debate.
- C. The increase in carbon dioxide is the most serious scientific issue.
- D. The disadvantages of burning fossil fuels exceed the advantages.
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