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Dendrochronology, the study of tree-ring records to glean

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Dendrochronology, the study of tree-ring records to glean [#permalink] New post 22 Jul 2012, 01:41
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Dendrochronology, the study of tree-ring records to glean information about the past, is possible because each year a tree adds a new layer of wood between the existing wood and the bark. In temperate and subpolar climates, cells added at the growing season's start are large and thin-walled, but later the new cells that develop are smaller and thick-walled; the growing season is followed by a period of dormancy. When a tree trunk is viewed in cross section, a boundary line is normally visible between the small-celled wood added at the end of the growing season in the previous year and the large-celled spring wood of the following year's growing season. The annual growth pattern appears as a series of larger and larger rings. In wet years rings are broad; during drought years they are narrow, since the trees grow less. Often, ring patterns of dead trees of different, but overlapping, ages can be correlated to provide an extended index of past climate conditions.

However, trees that grew in areas with a steady supply of groundwater show little variation in ring width from year to year; 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. Certain species sometimes add more than one ring in a single year, when growth halts temporarily and then starts again.
In the highlighted text, "uncertainties" refers to
(A) dendrochronologists' failure to consider the prevalence of erratic weather patterns
(B) inconsistencies introduced because of changes in methodology
(C) some tree species' tendency to deviate from the norm
(D) the lack of detectable variation in trees with complacent rings
(E) the lack of perfect correlation between the number of a tree's rings and its age
[Reveal] Spoiler:
E


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.
[Reveal] Spoiler:
A


The passage is primarily concerned with
(A) evaluating the effect of climate on the growth of trees of different species
(B) questioning the validity of a method used to study tree-ring records
(C) explaining how climatic conditions can be deduced from tree-ring patterns
(D) outlining the relation between tree size and cell structure within the tree
(E) tracing the development of a scientific method of analyzing tree-ring patterns
[Reveal] Spoiler:
C


the validity of choice of OA.
No such points are mentioned in the passage.
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Re: Dendrochronology, the study [#permalink] New post 22 Jul 2012, 03:20
In 2:55 minutes,
The rings are the main clues for understanding the age of a tree, the various shapes of the rings formed changes with the change of weather (water supplied to it, in different climatic condition).So, clearly it triggers the fact that the rings are the only link to find the age and if due to some reason the rings are uncertain to figure out by the researchers then it brings lack of correlation , i.e tree rings and its age.
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Re: Dendrochronology, the study [#permalink] New post 22 Jul 2012, 10:42
maybeam wrote:
Dendrochronology, the study of tree-ring records to glean information about the past, is possible because each year a tree adds a new layer of wood between the existing wood and the bark. In temperate and subpolar climates, cells added at the growing season's start are large and thin-walled, but later the new cells that develop are smaller and thick-walled; the growing season is followed by a period of dormancy. When a tree trunk is viewed in cross section, a boundary line is normally visible between the small-celled wood added at the end of the growing season in the previous year and the large-celled spring wood of the following year's growing season. The annual growth pattern appears as a series of larger and larger rings. In wet years rings are broad; during drought years they are narrow, since the trees grow less. Often, ring patterns of dead trees of different, but overlapping, ages can be correlated to provide an extended index of past climate conditions.

However, trees that grew in areas with a steady supply of groundwater show little variation in ring width from year to year; 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. Certain species sometimes add more than one ring in a single year, when growth halts temporarily and then starts again.


In the highlighted text, "uncertainties" refers to

(A) dendrochronologists' failure to consider the prevalence of erratic weather patterns
(B) inconsistencies introduced because of changes in methodology
(C) some tree species' tendency to deviate from the norm
(D) the lack of detectable variation in trees with complacent rings
(E) the lack of perfect correlation between the number of a tree's rings and its age

the validity of choice of OA.
No such points are mentioned in the passage.






In opening line it says "Dendrochronology, the study of tree-ring records to glean information about the past, is possible because each year a tree adds a new layer of wood between the existing wood and the bark."-------means every year tree adds a new layer (ring)

In last but one line it says "And trees in extremely dry regions may go a year or two without adding any rings, thereby introducing uncertainties into the count." ------means the regular pattern of "one ring per year" phenomenon may be not shown due to extremely dry weather.

So if scientists count the age of tree by counting number of rings and if the tree is having sometimes two rings in a year or no ring at all in any given year, this may lead to wrong age determination of the tree.


Hence E.

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Re: Dendrochronology, the study of tree-ring records to glean [#permalink] New post 04 Jan 2013, 22:34
Can you tell me what is wrong with B??
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Re: Dendrochronology, the study of tree-ring records to glean [#permalink] New post 07 Jan 2013, 12:50
roopika2990 wrote:
Can you tell me what is wrong with B??


B is incorrect because the methodology is not being changed. The uncertainties refers to how the age of the tree and the rings are not always correlative. I hope that helps :)
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Re: Dendrochronology, the study of tree-ring records to glean [#permalink] New post 16 Aug 2013, 23:30
Why B is wrong ?
Clearly, the second paragraph is questioning the validity of method explained in first paragraph.

The passage is primarily concerned with
(A) evaluating the effect of climate on the growth of trees of different species
(B) questioning the validity of a method used to study tree-ring records
(C) explaining how climatic conditions can be deduced from tree-ring patterns
(D) outlining the relation between tree size and cell structure within the tree
(E) tracing the development of a scientific method of analyzing tree-ring patterns
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Re: Dendrochronology, the study of tree-ring records to glean [#permalink] New post 21 Sep 2013, 08:49
commdiver wrote:
roopika2990 wrote:
Can you tell me what is wrong with B??


B is incorrect because the methodology is not being changed. The uncertainties refers to how the age of the tree and the rings are not always correlative. I hope that helps :)


Thanks a lot!! This helps .. :)
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Re: Dendrochronology, the study of tree-ring records to glean [#permalink] New post 14 Apr 2014, 20:39
I dismissed E and chose C, because E had the phrase "perfect correlation", which is not discussed in the passage and C talked about the "deviation" that certain species have on the count. Can someone explain where I made a mistake?
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Re: Dendrochronology, the study of tree-ring records to glean [#permalink] New post 27 Jun 2014, 22:10
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 didn't understand this answer.

Passage states something about dead tress of different, but overlapping, ages.

How can a question ask about trees in general that grew in the same area and that were of different, but overlapping, ages.

So how about answering this one then?
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Re: Dendrochronology, the study of tree-ring records to glean   [#permalink] 27 Jun 2014, 22:10
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