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#### GMAT Prep RC: Dendrochronology, the study of tree-ring

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 Post subject: GMAT Prep RC: Dendrochronology, the study of tree-ring  Posted: Tue Jul 20, 2010 2:27 am

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 Post subject: Re: GMAT Prep RC: Dendrochronology, the study of tree-ring  Posted: Thu Aug 05, 2010 6:48 pm
 ManhattanGMAT Staff

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Location: Southwest Airlines, seat 21C
 Okay, for the first question, the passage does nothing at all to suggest that climate conditions are unreliable if only one tree gives us data. In addition, for the second question, the passage is definitely not trying to throw out the whole science of dendrochronology. It seems both of your incorrect answers have the same root cause - you appear to be reading controversy and hostility into the passage where there is none. If you let that go, i would guess that it will become obvious why the correct answers are correct.. _________________Tim SandersManhattan GMAT Instructor

 Post subject: Re: GMAT Prep RC: Dendrochronology, the study of tree-ring  Posted: Mon Aug 06, 2012 5:32 pm
 Students

Posts: 203
 Hi Tim thanks for your response. Could you please also clarify the below questions.In the highlighted text, "uncertainties" refers to(A) dendrochronologists' failure to consider theprevalence of erratic weather patterns(B) inconsistencies introduced because of changes inmethodology(C) some tree species' tendency to deviate from thenorm(D) the lack of detectable variation in trees withcomplacent rings(E) the lack of perfect correlation between the numberof a tree's rings and its ageCould you please let me know what makes answer choice C wrong. And why is E correct?How can uncertainties here mean to "lack of perfect correlation between the number of a tree's rings and "ITS AGE"The excerpt from the passage i referred to was "these "complacent" rings tell nothing about changes in climate. And trees in extremely dry regions may go a year or two without adding any rings, thereby introducing uncertainties into the count."I took all this to mean that it would be difficult to determine the climate because of certain "irregularities" in the tree-rings.What am i missing here?Cheers

 Post subject: Re: GMAT Prep RC: Dendrochronology, the study of tree-ring  Posted: Wed Aug 15, 2012 3:51 pm
 ManhattanGMAT Staff

Posts: 768
 Your mistake is reading too much of the passage. This word concerns itself with only a single sentence:And trees in extremely dry regions may go a year or two without adding any rings, thereby introducing uncertainties into the count.Trees in dry regions may go a year (or two) without extra rings, introducing uncertainties into the count (of years that the tree had been alive) _________________Joe LuceroManhattan GMAT Instructor

 Post subject: Re: GMAT Prep RC: Dendrochronology, the study of tree-ring  Posted: Sat Jun 08, 2013 8:14 am
 Course Students

Posts: 10
 For the 1st question posted by the reader, The passage suggests which of the following about the ring patterns of two trees that grew in the same area and that were of different, but overlapping, ages?(A) The rings corresponding to the overlapping years would often exhibit similar patterns.(B) The rings corresponding to the years in which only one of the trees was alive would not reliably indicate the climate conditions of those years.(C) The rings corresponding to the overlapping years would exhibit similar patterns only if the trees were of the same species.(D) The rings corresponding to the overlapping years could not be complacent rings.(E) The rings corresponding to the overlapping years would provide a more reliable index of dry climate conditions than of wet conditions. I eliminated all choices but A&C. I liked A because it kind of was more wishy washy with "often" And then C kind of took in the info from the last para abt some trees acting differently , but dropped the "often" making it more definite..Hence A is better . Although i picked C while Answering , Is my reasoning WRT choosing A correct ? Thanks in advance

 Post subject: Re: GMAT Prep RC: Dendrochronology, the study of tree-ring  Posted: Wed Jun 12, 2013 1:38 am
 ManhattanGMAT Staff

Posts: 8179
 the relevant part of the passage says ...Often, ring patterns of dead trees of different, but overlapping, ages can be correlated to provide an extended index of past climate conditions.peter_griffin wrote:(A) The rings corresponding to the overlapping years would often exhibit similar patterns.if they can "be correlated", then some degree of similarity is necessary.also, as you noticed, "often" here matches "often" in the passage. that's important; if this choice suggested that this were always the case, then it'd be wrong.Quote:(C) The rings corresponding to the overlapping years would exhibit similar patterns only if the trees were of the same species.there's no mention of inter-species differences at all; the idea of species is irrelevant here. _________________Being well-dressed gives a feeling of inward tranquillity [that] religion is powerless to bestow.C.F. Forbes

 Post subject: Re: GMAT Prep RC: Dendrochronology, the study of tree-ring  Posted: Mon Jun 17, 2013 5:03 pm
 Students

Posts: 6
 Hi Ron,Could you please explain why is E wrong in the following question?The passage is primarily concerned with(A) evaluating the effect of climate on the growth oftrees of different species(B) questioning the validity of a method used to studytree-ring records(C) explaining how climatic conditions can be deducedfrom tree-ring patterns(D) outlining the relation between tree size and cellstructure within the tree(E) tracing the development of a scientific method ofanalyzing tree-ring patterns

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