PrepTest 153, Section 4, Question 3
Forests are among the world's most valuable resources,(432 more words not shown)
The information in the passage(7 more words not shown)
- AWhat percentage of(12 more words not shown)
- BHow many products(8 more words not shown)
- CBy means of(6 more words not shown)
- DWhat measures, if(15 more words not shown)
- EDo trees in(13 more words not shown)
Reading the passage
This question leaves the subject open. Rather than inventing a prediction, we'll ask a concrete question of each choice: could we answer it using information actually given? Mentioning the right topic isn't enough if the requested number, comparison, or recommendation is missing.
Working the answers
- A
The Amazon is discussed as an example in the oxygen argument, but its percentage of the world's tropical rain forest is never stated. We can't calculate it from the information provided.
- B
The opening gives more than 5,000 commercial products from forests generally. That's not a count of products from commercial plantations specifically. Naming wood and wood pulp later also doesn't tell us how many plantation products there are in total.
- CCorrect
The second paragraph directly answers this: photosynthesis is how trees generate oxygen (paragraph 2). We don't need an explanation of the chemistry; the question asks which process produces the oxygen, and the process is named.
- D
The author explains why production and decomposition cancel out, but doesn't propose measures to increase oxygen production. A suggestion about changing the soil or managing trees differently would be something we supplied ourselves.
- E
We aren't given a comparison between rain-forest trees and other vegetation. Thinking of bushes or algae may raise a sensible question, but the text doesn't tell us which absorbs more carbon dioxide. That makes it a question left unanswered here.
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