Plant scientists have been able to genetically engineer seeds to produce crops that are highly resistant to insect damage. Farmers planting such seeds can use much less pesticide. Although these seeds currently cost significantly more than nonengineered seeds, their cost is likely to decline. Since these seeds produce crop yields as high as those produced by nonengineered seeds, the use of genetically engineered seeds is likely to become increasingly common.Conclusion:
the use of genetically engineered seeds is likely to become increasingly commonWe see that the reasoning of the argument is basically that, since genetically engineered seeds enable use of less pesticide and their cost will likely decline, the use of such seeds by farmers is likely to increase.
Which of the following, if true, most strengthens the argument?The correct answer to this Strengthen question will provide an additional reason to believe the conclusion.
A. Plant scientists have not yet developed insect-resistant seeds for all commercially grown food crops.This choice is a little tricky to eliminate because it suggests that the availability of genetically engineered seeds may increase as plant scientists develop such seeds for additional crops.
At the same time, we can eliminate this choice because the fact that plant scientists may develop more genetically engineered seeds doesn't indicate that anyone will use the seeds.
Eliminate.
B. Consumers prefer to buy grains, fruits, and vegetables that have been grown using little or no pesticide.Strengthen questions can be tricky because their correct answers can come from unexpected angles. In this case, the correct answer brings in a new element, consumer preferences.
The passage says that farmers who use genetically engineered seeds can use less pesticide.
So, this choice indicates that, in addition to having lower pesticide costs, farmers who use genetically engineered seeds will produce crops that may be preferred by consumers because they have been grown with little pesticide.
Thus, since, presumably, farmers would prefer to produce crops that are preferred by consumers, this choice presents another reason why the use of genetically engineered seeds by farmers is likely to become increasingly common.
Keep.
C. Traditional methods of plant breeding have also resulted in some insect-resistant strains of plants.If anything, this choice weakens the case for the conclusion by suggesting that farmers may have alternatives to using genetically engineered seeds: they can instead use insect-resistant plants produced through traditional breeding methods.
Eliminate.
D. Crops grown from seeds that are genetically engineered to produce insect resistance will still be vulnerable to other types of pests.The fact that crops grown from genetically engineered seeds will be vulnerable to pests is not a reason to believe farmers will use such seeds.
Eliminate.
E. The cost of many commonly used agricultural pesticides is likely to decline as the use of genetically engineered seeds increases.If anything, this choice weakens the case for the conclusion by suggesting that, over time, a reason for using genetically engineered seeds, reduced pesticide costs, will become less significant as pesticide costs decrease.
So, although the scenario presented by this choice involves increasing use of genetically engineered seeds, the main point of this choice, that there will likely be a reduction in pesticide costs, goes against the idea that use of genetically engineered seeds will increase.
Eliminate.
Correct answer: B