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The popular notion that a tree s age can be determined by [#permalink]

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24 Nov 2011, 00:53

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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.

ksp, i think you should go to sc doc by whiplash2411(very nice!) in the following link cr-master-thread-101977.html specially --The Bang, Bang CR Guide - whiplash2411.

well, this doc. explains what is called a building a SHELL. This is what is exactly a shell. giving you some added nice information with respect to the premise. But this is wrong.

E is clearly the assumption here.

(p.s: sad but true, i too originally went for C, sometime these rules are hard to keep in mind and answers choices are very deviating)

The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable- If the count of the rings lost due to high temp was know, then it would be easy to predict the age of the tree.

Conclusion: 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.

C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring. => Negate, does not whether the counting rings is a reliable measure of the tree's age E. The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable.=> Negate, Attack the counting rings method is a reliable measure of the tree's age
_________________

Re: The popular notion that a tree s age can be determined by [#permalink]

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29 Sep 2012, 23:11

[quote="ksp"]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.

Hi can someone explain this entire question and its elimination process?

Re: The popular notion that a tree s age can be determined by [#permalink]

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01 Oct 2012, 14:17

Hello supriyas2,

Explanations are highlighted below. Hope it helps.

This is an assumption question - information that helps bridge gap between premises and conclusion is the best answer

Conclusion - 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

supriyas2 wrote:

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. precipitation is never mentioned in the argument. Out of scope B. Only the Brazilian ash loses rings because of excessive heat. Only? - extreme usage choices are incorrect unless stated in the argument C. Only one day of temperatures above 95 degrees Fahrenheit is needed to cause the Brazilian ash to lose a ring. Only one day? - extreme usage choices are incorrect unless stated in the argument D. The internal rings of all trees are of uniform thickness. thickness is never mentioned in the argument. Out of scope E. The number of rings that will be lost when the temperature exceeds 95 degrees Fahrenheit is not predictable. Correct. We cannot predict the number of rings

Hi can someone explain this entire question and its elimination process?

Re: The popular notion that a tree s age can be determined by [#permalink]

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15 Oct 2012, 06:18

I don't understand this, the passage does not say whether historical temperature variations can be measured accurately. If you can't give a log of temperature variations. Then who cares how many rings the tree had lost.

Re: The popular notion that a tree s age can be determined by [#permalink]

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06 Nov 2013, 23:45

IMO E. The conclusion of the argument is, - "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". This has 3 underlying assumptions - 1: Brazilian ash tree's age can be determined by counting rings. It is clearly written that "The popular notion that a tree’s age can be determined by counting the number of internal rings in its trunk is generally true". 2: Every time the temperature exceeds 95 degrees Fahrenheit, even momentarily, the Brazillian ash will lose some of its outer layers and the number of rings will decrease. Again, we can see that the question states, "the outermost layers of wood of the Brazilian ash often peel away when the temperature exceeds 95 degrees Fahrenheit". 3: We cannot, in any way possible, determine how many rings will the tree lose. This has to be true for the conclusion to be valid.

Now, the answer options: A: Irrelevant. Levels of precipitation has never been mentioned in the argument and has no impact on it whatsoever. B: Irrelevant. The argument is only calling into question the reliability of the tree's age determination through counting the rings. The occurrence of the same phenomenon in other trees is irrelevant at this point. C: This partially meets the 2nd assumption stated above. I believe it is this option that makes the question more difficult. To completely meet the assumption underlying the argument, the option should be replacing 'day' with 'moment'. It would then be a very strong contender for the right answer. Although negating this will deem the conclusion to be false it is not the right assumption. D: This option is again irrelevant. E: This is a totally valid assumption that is underlying the argument. You negate this, the conclusion falls apart.

Re: The popular notion that a tree s age can be determined by [#permalink]

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24 Nov 2014, 08:14

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Re: The popular notion that a tree s age can be determined by [#permalink]

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05 Dec 2015, 14:33

Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: The popular notion that a tree s age can be determined by
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05 Dec 2015, 14:33

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