Mature white pines intercept almost all the sunlight that : GMAT Critical Reasoning (CR)
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Mature white pines intercept almost all the sunlight that

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Mature white pines intercept almost all the sunlight that [#permalink]

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11 Oct 2008, 04:56
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Mature white pines intercept almost all the sunlight that shines on them. They leave a deep litter that dries readily and they grow to prodigious height so that, even when there are large gaps in a stand of such trees, little light reaches the forest floor. For this reason white pines cannot regenerate in their own shade. Thus, when in a dense forest a stand of trees consists of nothing but mature white pines, it is a fair bet that:

Which one of the following most logically concludes the argument?

A) the ages of the trees in the stand do not differ from each other by much more than the length of time it takes a white pine to grow to maturity

B) the land on which the stand is now growing had been cleared of all trees at the time when the first of the white pines started growing

C) competition among the trees in the stand for sunlight will soon result in some trees' dying and the stand thus becoming thinner

D) other species of trees will soon begin to colonize the stand, eventually replacing all of the white pines

E) any differences in the heights of the trees in the stand are attributable solely to differences in the ages of the trees

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11 Oct 2008, 20:12
A, i think
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12 Oct 2008, 03:52
bigtreezl wrote:
A, i think

Kindly support with explanations !!!
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30 Oct 2008, 00:09
Question Type: Inference

Summary of stimulus:
1) Mature pines intercept almost all the light that shines on them.
2) Even when there are gaps, very little light reaches the floor.
3) Pines cannot regenerate in the shade (thus, they need light)
4) Conclusion: If there are only mature white pines.....

Prephrase: They would all roughly be the same age.

A) the ages of the trees in the stand do not differ from each other by much more than the length of time it takes a white pine to grow to maturity
This matches the prephrase perfectly. Trees could not have ages that differ by a lot because the shade from the mature trees would stymie their growth.
B) the land on which the stand is now growing had been cleared of all trees at the time when the first of the white pines started growing
Eliminate: This is playing off the timing aspect. Who knows how it was in the past. Perhaps it was flat land and didn't need to be cleared.
C) competition among the trees in the stand for sunlight will soon result in some trees' dying and the stand thus becoming thinner
Eliminate: Unwarranted prediction. "will soon result in some dying"?
D) other species of trees will soon begin to colonize the stand, eventually replacing all of the white pines
Eliminate: Out of scope. "other species of trees"
E) any differences in the heights of the trees in the stand are attributable solely to differences in the ages of the trees
Eliminate: Too strong. "solely". There could be numerous factors such as rain, fire, etc..
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30 Oct 2008, 07:03
I chose A as well, based on POE

Prephrase: They would all roughly be the same age.

That's a huge assumption no?

somerandomguy wrote:
Question Type: Inference

Summary of stimulus:
1) Mature pines intercept almost all the light that shines on them.
2) Even when there are gaps, very little light reaches the floor.
3) Pines cannot regenerate in the shade (thus, they need light)
4) Conclusion: If there are only mature white pines.....

Prephrase: They would all roughly be the same age.

A) the ages of the trees in the stand do not differ from each other by much more than the length of time it takes a white pine to grow to maturity
This matches the prephrase perfectly. Trees could not have ages that differ by a lot because the shade from the mature trees would stymie their growth.
B) the land on which the stand is now growing had been cleared of all trees at the time when the first of the white pines started growing
Eliminate: This is playing off the timing aspect. Who knows how it was in the past. Perhaps it was flat land and didn't need to be cleared.
C) competition among the trees in the stand for sunlight will soon result in some trees' dying and the stand thus becoming thinner
Eliminate: Unwarranted prediction. "will soon result in some dying"?
D) other species of trees will soon begin to colonize the stand, eventually replacing all of the white pines
Eliminate: Out of scope. "other species of trees"
E) any differences in the heights of the trees in the stand are attributable solely to differences in the ages of the trees
Eliminate: Too strong. "solely". There could be numerous factors such as rain, fire, etc..
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30 Oct 2008, 07:32
A for me too
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30 Oct 2008, 07:33
It is A.

Mature trees won't allow the small ones to grow thus the other trees must have grown along with the mature trees, just lagging behind by less than the time it takes for a tree to grow to maturity.
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30 Oct 2008, 09:10
I chose A as well, based on POE

Prephrase: They would all roughly be the same age.

That's a huge assumption no?

somerandomguy wrote:
Question Type: Inference

Summary of stimulus:
1) Mature pines intercept almost all the light that shines on them.
2) Even when there are gaps, very little light reaches the floor.
3) Pines cannot regenerate in the shade (thus, they need light)
4) Conclusion: If there are only mature white pines.....

Prephrase: They would all roughly be the same age.

A) the ages of the trees in the stand do not differ from each other by much more than the length of time it takes a white pine to grow to maturity
This matches the prephrase perfectly. Trees could not have ages that differ by a lot because the shade from the mature trees would stymie their growth.
B) the land on which the stand is now growing had been cleared of all trees at the time when the first of the white pines started growing
Eliminate: This is playing off the timing aspect. Who knows how it was in the past. Perhaps it was flat land and didn't need to be cleared.
C) competition among the trees in the stand for sunlight will soon result in some trees' dying and the stand thus becoming thinner
Eliminate: Unwarranted prediction. "will soon result in some dying"?
D) other species of trees will soon begin to colonize the stand, eventually replacing all of the white pines
Eliminate: Out of scope. "other species of trees"
E) any differences in the heights of the trees in the stand are attributable solely to differences in the ages of the trees
Eliminate: Too strong. "solely". There could be numerous factors such as rain, fire, etc..

Actually, no it wouldn't be a huge assumption. It's actually something a person would be able to deduct from the information. I could also draw the conclusion that they are roughly the same height. Should one tree be a lot shorter than the other ones, it wouldn't survive because it receives no light. HTH.
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31 Oct 2008, 13:55
Hi guys,

for me the answer is between A and B

B when the first tree started to grow, it blocks the light and nothing can grow around it

I would say B

OA?

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01 Nov 2008, 13:03
IMO B......
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07 May 2011, 13:40
i think the answer has to be A and i dont think there is any contention between A and E.this question sucked 2:15 min
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Re: CR -pine trees   [#permalink] 07 May 2011, 13:40
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