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24 Dec 2004, 20:13
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Deep tillage is even more deleterious to the world's topsoil supply than previously believed. For example, farmers who till deeply are ten times more likely to lose topsoil to erosion than are farmers who use no-till methods. Results like these make it clear that farmers who now till deeply should strive, by using other topsoil aeration techniques, to incorporate no-till methods instead.
The argument depends on assuming which one of the following?
A. Topsoil erosion does not make farmers want to till more deeply.
B. In deep-tillage farming, the deeper one tills, the greater the susceptibility to topsoil erosion.
C. Tilling by any method other than deep tillage is not a viable option.
D. The most expensive farming methods employ topsoil aeration techniques other than deep tillage.
E. On average, topsoil that is no-tilled is more aerated than topsoil that is tilled deeply.
please explain your answer.
The argument depends on assuming which one of the following?
A. Topsoil erosion does not make farmers want to till more deeply.
B. In deep-tillage farming, the deeper one tills, the greater the susceptibility to topsoil erosion.
C. Tilling by any method other than deep tillage is not a viable option.
D. The most expensive farming methods employ topsoil aeration techniques other than deep tillage.
E. On average, topsoil that is no-tilled is more aerated than topsoil that is tilled deeply.
please explain your answer.
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24 Dec 2004, 22:11
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Not an obvious one. Let's try it.
The argument depends on assuming which one of the following?
A. Topsoil erosion does not make farmers want to till more deeply.
Whether or not farmers want to till more deeply is not relevant to the conclusion that deep tilling is bad. Farmers could just be misinformed, or have poor instincts.
B. In deep-tillage farming, the deeper one tills, the greater the susceptibility to topsoil erosion.
Deep-till is deep-till, it's all bad. Degree of susceptibility to soil erosion is outside the scope of the question.
C. Tilling by any method other than deep tillage is not a viable option.
This isn't a great answer, but it's the best one. The argument basically says "deep till bad, therefore don't till at all". If you reverse this answer choice to read "tilling by another method IS a viable option", that weakens the conclusion, so you know you have an assumption upon which the argument is based. This is the correct answer, I believe.
D. The most expensive farming methods employ topsoil aeration techniques other than deep tillage.
The argument doesn't care how much any aeration technique costs, it's outside scope.
E. On average, topsoil that is no-tilled is more aerated than topsoil that is tilled deeply.
Not necessary for no-tilled topsoil to be MORE aerated than deeply tilled topsoil. Incorrect.
My choice: C
The argument depends on assuming which one of the following?
A. Topsoil erosion does not make farmers want to till more deeply.
Whether or not farmers want to till more deeply is not relevant to the conclusion that deep tilling is bad. Farmers could just be misinformed, or have poor instincts.
B. In deep-tillage farming, the deeper one tills, the greater the susceptibility to topsoil erosion.
Deep-till is deep-till, it's all bad. Degree of susceptibility to soil erosion is outside the scope of the question.
C. Tilling by any method other than deep tillage is not a viable option.
This isn't a great answer, but it's the best one. The argument basically says "deep till bad, therefore don't till at all". If you reverse this answer choice to read "tilling by another method IS a viable option", that weakens the conclusion, so you know you have an assumption upon which the argument is based. This is the correct answer, I believe.
D. The most expensive farming methods employ topsoil aeration techniques other than deep tillage.
The argument doesn't care how much any aeration technique costs, it's outside scope.
E. On average, topsoil that is no-tilled is more aerated than topsoil that is tilled deeply.
Not necessary for no-tilled topsoil to be MORE aerated than deeply tilled topsoil. Incorrect.
My choice: C
24 Dec 2004, 22:30
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So if you negate an answer choice such as C, the objective is to weaken the conclusion right? And if you want to weaken an answer, after you negate the answer choice, you want the answer choice to strengthen the conclusion?
