PrepTest 135, Section 3, Question 26
As part of an international effort to address(467 more words not shown)
It can be inferred from(42 more words not shown)
- APopulations of symbiotic(9 more words not shown)
- BUnwanted plant species(7 more words not shown)
- CThe chance of(8 more words not shown)
- DThe number of(11 more words not shown)
- EPopulations of other(7 more words not shown)
Reading the passage
The disease organisms harm native plants. Beneficial fungi help by protecting roots against their effects. If those disease organisms were eliminated, the plants would face less of that threat, so we should predict a better chance of survival. That prediction concerns the plants. We haven't been given a complete account of how every population of soil organisms would respond.
Working the answers
- A
Nothing establishes that beneficial mycorrhiza would initially decline. Knowing they protect plants from disease doesn't tell us that their population must fall when the disease organisms disappear.
- B
Removing a threat to native plants doesn't make thistles unable to survive. The author never gives that absolute consequence.
- CCorrect
A beneficial native plant would be more likely to survive without the aggressive organisms harming it. This follows from the role those organisms play in the explanation of poor growth.
- D
An increase in every type of beneficial microorganism goes beyond the described relationship. We know why plants would benefit; we don't know how all those populations would change over time.
- E
No proportional increase in other disease organisms is established. That would require another relationship among organisms that the author doesn't supply.
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