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Plant scientists have been able to genetically engineer

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Senior Manager
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Plant scientists have been able to genetically engineer [#permalink] New post 24 Jul 2009, 23:44
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

62% (01:47) correct 37% (00:51) wrong based on 8 sessions
Plant scientists have been able to genetically engineer vegetable seeds
to produce crops that are highly resistant to insect damage. Although
these seeds currently cost more than conventional seeds, their cost is
likely to decline. Moreover, farmers planting them can use far less pesticide,
and most consumers prefer vegetables grown with less pesticide,
therefore, for crops for which these seeds can be developed, their use
is likely to become the norm.
which of the following would be most useful to know in evaluating the
argument above?
A. Whether plant scientists have developed insect-resistant seeds
For every crop that is currently grown commercially
B. Whether farmers typically use agricultural pesticides in larger
Amounts than is necessary to prevent crop damage.
C. Whether plants grown from the new genetically engineered seeds
Can be kept completely free of insect damage.
D. Whether seeds genetically engineered to produce insect-resistant
crops generate significantly lower per acre crop yields than do
currently used seeds.
E. Whether most varieties of crops currently grown commercially have
Greater natural resistance to insect damage than did similar varieties
in the past.
OA after explanations
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Re: Plant Scientists [#permalink] New post 25 Jul 2009, 00:00
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IMO D

A. Whether plant scientists have developed insect-resistant seeds For every crop that is currently grown commercially -Incorrect. Argument already saying "is likely to become the norm", that means it is still in initial phase of development.
B. Whether farmers typically use agricultural pesticides in larger Amounts than is necessary to prevent crop damage. -Out of scope. The argument just says that "farmers planting them can use far less pesticide". Its "far less" then the normal amount used today, and people will prefer vegetables using less amount of pesticides than the normal amount
C. Whether plants grown from the new genetically engineered seeds Can be kept completely free of insect damage. -Argument already saying that its "highly resistant to insect damage". That means there is still chances, though may be very little, of insect damage.
D. Whether seeds genetically engineered to produce insect-resistant crops generate significantly lower per acre crop yields than do currently used seeds. -Correct. If the new seeds generate significantly low crop yield, then it may become difficult to become a norm.
E. Whether most varieties of crops currently grown commercially have Greater natural resistance to insect damage than did similar varieties in the past. -Irrelevant
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Re: Plant Scientists [#permalink] New post 20 Aug 2009, 03:10
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I've looked that question again, however I did not understand the reasoning. Could someone explain the reasoning behind it ? Kudos will be appreciated to the good reasonings . Thanks :)
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Re: Plant Scientists [#permalink] New post 20 Aug 2009, 06:04
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In this kind of question you're looking for an answer choice that if is true strengthen/weakens the argument and that if is false has weakens/strengthen the argument.

Premise 1: Plant scientists have been able to genetically engineer vegetable seeds
to produce crops that are highly resistant to insect damage

Premise 2: The seeds currently cost more than conventional seeds, their cost is
likely to decline

Premise 3: farmers planting them can use far less pesticide

Premise 4: most consumers prefer vegetables grown with less pesticide

Conclusion : their use is likely to become the norm

The author provides all the evidence to support that the use of the seeds will become a norm


A. Whether plant scientists have developed insect-resistant seeds for every crop that is currently grown commercially

If this is false nothing hampers that the seeds become the norm.
If this is true more seeds will become the norm.

A is out.

B. Whether farmers typically use agricultural pesticides in larger amounts than is necessary to prevent crop damage.

if this is true with the new seeds farmers will need to put less pesticides; the amount decreases
if this is false with the new seeds farmers will need to put less pesticides; the amount decreases even in a greater proportion.
The effect is the same so B is out.

C. Whether plants grown from the new genetically engineered seeds can be kept completely free of insect damage.

if this is true, this strengthens the argument
if this is false, we do not whether the current seeds are completely free of damage (in principle they are not) so no effect

D. Whether seeds genetically engineered to produce insect-resistant crops generate significantly lower per acre crop yields than do currently used seeds.

If this is true perhaps the farmers will want to continue use the current seeds because they produce greater crop per acre
if this is false the argument is strengthen because farmers will want to use the new seeds.

Correct. Two different effects

E. Whether most varieties of crops currently grown commercially have greater natural resistance to insect damage than did similar varieties
in the past.

This does not address the new seeds so is irrelevant.
Re: Plant Scientists   [#permalink] 20 Aug 2009, 06:04
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