Q27: Rye sown in the fall and plowed into the soil in early : GMAT Critical Reasoning (CR)
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# Q27: Rye sown in the fall and plowed into the soil in early

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Manager
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Q27: Rye sown in the fall and plowed into the soil in early [#permalink]

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15 Jul 2007, 07:22
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Q27:
Rye sown in the fall and plowed into the soil in early spring leaves a residue that is highly effective at controlling broad-leaved weeds, but unfortunately for only about 45 days. No major agricultural crop matures from seed in as little as 45 days. Synthetic herbicides, on the other hand, although not any longer-lasting, can be reapplied as the crop grows. Clearly, therefore, for major agricultural crops, plowing rye into the soil can play no part in effective weed control.

The argument is most vulnerable to the objection that it fails to

A. consider that there might be minor, quick-growing crops that do mature in 45 days or less
B. identify any alternative method of weed control that could be used instead of the method it rejects
C. distinguish among the various kinds of synthetic herbicides
D. allow for the possibility of combining the two weed-control methods it mentions
E. allow for the possibility that plants other than rye, handled the same way, might have the same effect
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15 Jul 2007, 07:29
it should be D...
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15 Jul 2007, 07:36
taking separately

If only rye can be used, then lasting only 45 days it wouldn't be an effective weed control

If only herbicide is used then it can last as an effective weed control since it can be reapplied.

but if the argument doesn't assume explicitely that they can be used both at a time then the conclusion that rye play no part in effective weed control can't be sustained.

since it could be used as control for first 45 days and then be followed by herbicide, the benefit for eg could be cost savings in herbicide.
15 Jul 2007, 07:36
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