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Even more than mountainside slides of mud or snow, naturally

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Even more than mountainside slides of mud or snow, naturally [#permalink] New post 16 May 2005, 05:36
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Even more than mountainside slides of mud or snow, naturally occurring forest fires promote the survival of aspen trees. Aspens' need for fire may seem illogical since aspens are particularly vulnerable to fires; whereas the bark of most trees consists of dead cells, the aspen's bark is a living, functioning tissue that - - along with the rest of the tree - -succumbs quickly to fire.
The explanation is that each aspen, while appearing to exist separately as a single tree, is in fact only the stem or shoot of a far larger organism. A group of thousands of aspens can actually constitute a single organism, called a clone, that shares an interconnected root system and a unique set of genes. Thus, when one aspen --a single stem --dies, the entire clone is affected. While alive, a stem sends hormones into the root system to suppress formation of further stems. But when the stem dies, its hormone signal also ceases. If a clone loses many stems simultaneously, the resulting hormonal imbalance triggers a huge increase in new, rapidly growing shoots that can outnumber the ones destroyed. An aspen grove needs to experience fire or some other disturbance regularly, or it will fail to regenerate and spread. Instead, coniferous trees will invade the aspen grove's borders and increasingly block out sunlight needed by the aspens.
The primary purpose of the passage is to explain the
A.qualities that make a particular organism unique
B.evolutionary change undergone by a particular organism
C.reasons that a phenomenon benefits a particular organism
D.way in which two particular organisms compete for a resource
E.means by which a particular organism has been able to survive in a barren region

It can be inferred from the passage that when aspen groves experience a "disturbance", such a disturbance
A.leads to a hormonal imbalance within an aspen clone
B.provides soil conditions that are favorable for new shoots
C.thins out aspen groves that have become overly dense
D.suppresses the formation of too many new aspen stems
E.protects aspen groves by primarily destroying coniferous trees rather than aspens

The author of the passage refers to "the bark of most trees" most likely in order to emphasize the
A.vulnerability of aspens to damage from fire when compared to other trees
B.rapidity with which trees other than aspens succumb to destruction by fire
C.relatively great degree of difficulty with which aspens catch on fire when compared to other trees
D.difference in appearance between the bark of aspens and that of other trees
E.benefits of fire to the survival of various types of trees
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 [#permalink] New post 22 May 2005, 20:10
1. C
2. A
3. A


OA Please..
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 [#permalink] New post 22 May 2005, 20:27
1. C
2. A
3. A
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 [#permalink] New post 22 May 2005, 20:57
agree with shalinikhatri & meenu
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 [#permalink] New post 23 May 2005, 19:17
C, A, A.
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Re: RC - Aspens [#permalink] New post 27 Oct 2010, 06:38
Can someone explain #2 to me. I chose (c) thins out aspen groves that become overly dense. I thought that the disturbance causes the trees to set on fire and and allows the sunlight to come in so the aspen trees can grow again.

How do you target the answer for A ...once you find the term disturbance... I was confused by the rest of the sentence "it will fail to regenerate and spread"...because the passage doesnt really explain what that means.

help pls!
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Re: RC - Aspens [#permalink] New post 28 Oct 2010, 00:40
pb_india wrote:
Even more than mountainside slides of mud or snow, naturally occurring forest fires promote the survival of aspen trees. Aspens' need for fire may seem illogical since aspens are particularly vulnerable to fires; whereas the bark of most trees consists of dead cells, the aspen's bark is a living, functioning tissue that - - along with the rest of the tree - -succumbs quickly to fire.
The explanation is that each aspen, while appearing to exist separately as a single tree, is in fact only the stem or shoot of a far larger organism. A group of thousands of aspens can actually constitute a single organism, called a clone, that shares an interconnected root system and a unique set of genes. Thus, when one aspen --a single stem --dies, the entire clone is affected. While alive, a stem sends hormones into the root system to suppress formation of further stems. But when the stem dies, its hormone signal also ceases. If a clone loses many stems simultaneously, the resulting hormonal imbalance triggers a huge increase in new, rapidly growing shoots that can outnumber the ones destroyed. An aspen grove needs to experience fire or some other disturbance regularly, or it will fail to regenerate and spread. Instead, coniferous trees will invade the aspen grove's borders and increasingly block out sunlight needed by the aspens.
The primary purpose of the passage is to explain the
A.qualities that make a particular organism unique
B.evolutionary change undergone by a particular organism
C.reasons that a phenomenon benefits a particular organism
D.way in which two particular organisms compete for a resource
E.means by which a particular organism has been able to survive in a barren region

It can be inferred from the passage that when aspen groves experience a "disturbance", such a disturbance
A.leads to a hormonal imbalance within an aspen clone
B.provides soil conditions that are favorable for new shoots
C.thins out aspen groves that have become overly dense
D.suppresses the formation of too many new aspen stems
E.protects aspen groves by primarily destroying coniferous trees rather than aspens

The author of the passage refers to "the bark of most trees" most likely in order to emphasize the
A.vulnerability of aspens to damage from fire when compared to other trees
B.rapidity with which trees other than aspens succumb to destruction by fire
C.relatively great degree of difficulty with which aspens catch on fire when compared to other trees
D.difference in appearance between the bark of aspens and that of other trees
E.benefits of fire to the survival of various types of trees

C
A
A too
please post the OAs....
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Re: RC - Aspens [#permalink] New post 28 Oct 2010, 22:03
b
d
a
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Re: RC - Aspens [#permalink] New post 28 Oct 2010, 23:05
@rock rock....
You have taken the disturbance to refer directly to the sentence mentioned " An aspen grove needs to experience fire or some other disturbance regularly, or it will fail to regenerate and spread."
Whereas we need to look into the passage as a whole.
The author refers to the fire when he mentions disturbance. It does not refer to just the line " An aspen grove needs to experience fire or some other disturbance regularly, or it will fail to regenerate and spread."

The fire/disturbance causes the stem to die thereby ceasing the hormones which is sent to the root system. Hence it can be said that that the fire leads to an imbalance in the aspen clone. The above two lines are not assumptions. They are rather mentioned in the passage.

It can be inferred from the passage that when aspen groves experience a "disturbance", such a disturbance

A.leads to a hormonal imbalance within an aspen clone
- Right answer.
B.provides soil conditions that are favorable for new shoots
- Not mentioned in the passage
C.thins out aspen groves that have become overly dense
- density of the aspen growth is not mentioned anywhere in the passage. We are not supposed to make broad assumptions here.

D.suppresses the formation of too many new aspen stems
- Opposite answer. Incorrect.

E.protects aspen groves by primarily destroying coniferous trees rather than aspens
- Incorrect. Coniferous only block sunlight. Nothing is mentioned about destroying confierous in the passage.
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Re: RC - Aspens [#permalink] New post 29 Oct 2010, 05:21
thanks ramgmat ....very helpful walkthrough. thats my problem - even if i didnt "see" the connection between the fire and hormonal imbalance, id eliminated all answers except for D...and given that D forced me to make broad assumptions, I should have eliminated that as well...
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Re: RC - Aspens [#permalink] New post 21 Apr 2011, 10:50
The primary purpose of the passage is to explain the
A.qualities that make a particular organism unique << it is mentioned that 'most trees', so aspen is not unique
B.evolutionary change undergone by a particular organism << nice distractor, but not evolution is mentioned in the passage
C.reasons that a phenomenon benefits a particular organism - Bingo!
D.way in which two particular organisms compete for a resource << wow.. miles away
E.means by which a particular organism has been able to survive in a barren region << what does barren mean? :) I don't know and this text is not about survival
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Re: RC - Aspens [#permalink] New post 18 Aug 2013, 07:34
AN225 wrote:
The primary purpose of the passage is to explain the
A.qualities that make a particular organism unique << it is mentioned that 'most trees', so aspen is not unique
B.evolutionary change undergone by a particular organism << nice distractor, but not evolution is mentioned in the passage
C.reasons that a phenomenon benefits a particular organism - Bingo!
D.way in which two particular organisms compete for a resource << wow.. miles away
E.means by which a particular organism has been able to survive in a barren region << what does barren mean? :) I don't know and this text is not about survival



OA answer: 1: a, 2: c, 3: d.
I have answered the first one wrong and still look for the explaination.
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Re: Even more than mountainside slides of mud or snow, naturally [#permalink] New post 18 Aug 2013, 19:40
A (But after seeing the other posts I think C is correct option)
A
A
Re: Even more than mountainside slides of mud or snow, naturally   [#permalink] 18 Aug 2013, 19:40
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