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LSAT Preptest 153, Section 4, Question 3

Passage 1: Deforestation

Explanation

A. The passage does not provide specific percentages regarding how much of the world's tropical rainforest is in the Brazilian Amazon region.


B. While the passage does mention that there are over 5,000 commercial products derived from forest plants, it does not specify how many are from plants grown on commercial plantations.


C. (Correct Response) In the first paragraph, the passage discusses the role of trees in the oxygen cycle. It clarifies that trees produce oxygen through photosynthesis, a process where they absorb carbon dioxide and release oxygen. However, it also notes that this oxygen is consumed again when trees die and decompose, leading to a net zero effect on oxygen levels.


D. The passage does not discuss any measures that could be taken to enhance oxygen production by existing forests.


E. The passage does not compare the carbon dioxide absorption of trees in tropical rain forests to other types of vegetation.

The passage directly mentions that trees in forests produce oxygen through the process of photosynthesis. This information is found in the first paragraph where the passage debunks the myth that the Brazilian Amazon functions as the "lungs of the earth." It explains that while trees do produce oxygen through photosynthesis, they also consume an equivalent amount of oxygen when they decompose, leading to no net oxygen contribution.

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