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The popular notion that a tree's age can be determined by

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The popular notion that a tree's age can be determined by [#permalink] New post 13 Oct 2009, 05:54
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The popular notion that a tree's age can be determined by counting the number of internal rings in its trunk is generally true. However, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit will its rings be a reliable measure of the tree's age.

Which of the following is an assumption on which the argument above depends?

A. The growth of new rings in a tree is not a function of levels of precipitation.
B. Only the Brazilian ash loses rings because of excessive heat.
C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring.
D. The internal rings of all trees are of uniform thickness.
E. The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable

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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 06:44
I will choose "A"

Going with PoE

Round 1
A - This can be right
B - This is being clearly stated in the argument and is therefore not an assumption
C - This can be right
D - This is not at al relevant to the premise or the conclusion
E - This has also been stated in the argument and should therefore not be an assumption

Round 2
We are left with A and C.
"A" - "A" is more appropriate because it affects the conclusion directly, if this is the assumption only then conclusion can be true.
"C" - for how long the temprature should stay at 95 for the ring to shed is no where being mentioned either in the premise or in conclusion..it therefore seems un-related.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 06:51
IMO its E ...If there is no way only then can the age of the tree be not determined accurately...Paul please explain where does this come as stated in the argument.

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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 07:02
IMO, OA is E
Quote:
The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable


As we cannot predict how many rings were lost because of the temperature fluctuations,we cannot predict the age of the tree. - I would go for this choice.

Quote:
A. The growth of new rings in a tree is not a function of levels of precipitation. - Irrelevant
B. Only the Brazilian ash loses rings because of excessive heat. - Out of Scope
C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring. - Out of Scope
D. The internal rings of all trees are of uniform thickness. - Irrelevant

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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 07:09
I will go for E.

"The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable" . Negating this statement. The conclusion becomes invalid.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 07:19
and excerpt from the argument is

...leaving the tree with fewer rings than it would otherwise have. ...

does "fewer" not directly mean that how many will shed is not predictable ?

I therefore think that "E" is already available in the argument and therefore after that "A" is the only possible answer.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 07:47
AGREE ON E
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 07:55
An assumption can be a parapharse of the premise given in the argument. You can still consider it a valid assumption eventhough it is a repeat.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 08:14
agree with vannu's reasoning
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 11:17
IEsailor wrote:
agree with vannu's reasoning


I do too! Especially since the OA is E
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 Oct 2009, 19:05
E is correct.

Try to negate A. The negation will strengthen or make the argument valid. Only if there was precipitation every year the age of tree can be determined. If this was not true then there was some other reason for the formation of new rings, and then the entire reasoning of the argument is destroyed.
A was correct if 'not' was omitted from A.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 19 Oct 2009, 06:03
assumption must be
1, in context of evidence
2, support conclusion
3,pass negation tess

the answer meet 2,and 3, but is out of context is attractive but wrong. A is a sample of this. E is correct.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 20 Oct 2009, 02:36
I first chose C, because I thought that the central point was to determine the age of the tree regardless the number of times the temperature goes above 95.

But paraphrasing the argument, we could say: "Only when the temperature does not go above 95, we can determine the age of the Brazilian tree". Thus, the answer E is the best.
(one more to the error log!)
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 May 2011, 03:19
clean E.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 13 May 2011, 21:09
so simple E . but took 1:21 min , and this is a relatively small stimulus, so the timing is the issue.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 16 Sep 2011, 05:37
E it is... Not really a 700 level question..
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 16 Sep 2011, 08:31
vannu wrote:
An assumption can be a parapharse of the premise given in the argument. You can still consider it a valid assumption eventhough it is a repeat.



Is that correct..Can it be a paraphrase?Shoudn't it be something which is unstated in the passage(not out of scope, but unstated).

Here E is the clear winner though..
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 16 Sep 2011, 13:06
I picked E...I think is the most logical one.
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 18 Sep 2011, 01:26
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Re: Tuesday Q5 - Tree Rings [#permalink] New post 20 Sep 2011, 19:53
I will go with 'E'.
Re: Tuesday Q5 - Tree Rings   [#permalink] 20 Sep 2011, 19:53
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