The chanterelle, a type of wild mushroom, grows beneath host : GMAT Critical Reasoning (CR)
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The chanterelle, a type of wild mushroom, grows beneath host

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The chanterelle, a type of wild mushroom, grows beneath host [#permalink]

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21 Nov 2005, 16:34
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The chanterelle, a type of wild mushroom, grows beneath host trees such as the Douglas fir, which provide it with necessary sugars. The underground filaments of chanterelles, which extract the sugars, in turn provide nutrients and water for their hosts. Because of this mutually beneficial relationship, harvesting the chanterelles growing beneath a Douglas fir seriously endangers the tree.

Which of the following, if true, casts the most doubt on the conclusion drawn above?

(A) The number of wild mushrooms harvested has increased in recent years.

(B) Chanterelles grow not only beneath Douglas firs but also beneath other host trees.

(C) Many types of wild mushrooms are found only in forests and cannot easily be grown elsewhere.

(D) The harvesting of wild mushrooms stimulates future growth of those mushrooms.

(E) Young Douglas fir seedlings die without the nutrients and water provided by chanterelle filaments.
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Director
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21 Nov 2005, 16:38
Here is my line of reasoning.

C-growing mushrooms beneath tree endangers tree
E-cuz they have a beneficial relationship (although i dont know why it would be dangerous if it were benificial for the tree)

A-OS
B-OS
C-OS
D-OS

I chose E cuz if the tree would die without the mushroom then the mushroom would not endanger the tree but it would help it.
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21 Nov 2005, 17:15
my answer is D
Director
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21 Nov 2005, 17:18
can you explain your reasoning juh? thanks
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21 Nov 2005, 18:58
D is the best choice. If harvesting the mushrooms will stimulate further growth, then the douglas fir won't be harmed by the harvest.
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21 Nov 2005, 23:43
why would growing the mushroom under the fir endanger the tree? cuz it takes away sugar? I dont understand.
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22 Nov 2005, 02:17
It is a clear E for me.

If young Douglas fir seedlings die without the nutrients and water provided by chanterelle filaments, Harvesting chanterelle can not seriously endenger the tree.
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22 Nov 2005, 02:43
Conclusion - Harvesting the chanterelles growing beneath a Douglas fir seriously endangers the tree

A - Incorrect. Does not matter if it has increased or decreased. Out of Scope.
B - Incorrect. Out of Scope.
C - Incorrect. Out of Scope.
D - Correct. Casts the doubt that if by cutting the growth is simulated it makes sense to harvest it.
E - Incorrect. Out of scope.

Hence D is correct as it casts the doubt and weakens the conclusion.
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22 Nov 2005, 04:30
Don't know for sure but I think it should to be E....
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22 Nov 2005, 06:00
IMO, E strengthens the argument.

D is the best answer.

The argument says that removing chanterelles will endanger the Douglas fir.

(D) says that removing the chanterelles will let more chanterelles to grow.
(E) says that removing the chanterelles will kill the seeds of the Douglas fir.
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22 Nov 2005, 08:48
E strengthens the conclusion. We are asked to weaken, hence D. Harvesting those delicate shrooms will undoubtedly promote greater future growth and improve the symbiotic relationship with the Douglas Fir.

(D)
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22 Nov 2005, 09:40
the conclusion says that harvesting mushrooms under the tree endagers the tree becasue of the symbiotic relationship.

So if there are more mushrooms, there would be more of a symbiotic relationship.

Wouldnt that support the argument?
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22 Nov 2005, 09:55
Stimulates does not equal endanger. I will stick with D as it contradicts the conclusion.
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22 Nov 2005, 10:18
ahh, makes sense now, i was confused by the definition of Harvest
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22 Nov 2005, 10:20
and the answer is D
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Re: CR Mushrooms [#permalink]

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22 Nov 2005, 10:26
Fact: Mushroom provides water and nutrients to the tree under which it grows.
Conclusion: Havesting mushrooms grow under the tree endangers the tree.

Ask for weekening.

(A) The number of wild mushrooms harvested has increased in recent years.
Perhaps a lot of trees are already endangered. Can't weaken.

(B) Chanterelles grow not only beneath Douglas firs but also beneath other host trees.
We are talking about mushroom under the tree. Other mushrooms are irrelevant.

(C) Many types of wild mushrooms are found only in forests and cannot easily be grown elsewhere.
So? Havesting them can still hurt trees.

(D) The harvesting of wild mushrooms stimulates future growth of those mushrooms.
If harvesting actually stimulates growth, then it is a good thing for the trees for they would get even more water and nutrientients. Weaken the conclusion.

(E) Young Douglas fir seedlings die without the nutrients and water provided by chanterelle filaments.
This strengthens the conclusion that havesting mushroom harms the trees.

So D.
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Re: CR Mushrooms [#permalink]

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22 Nov 2005, 13:28
HongHu wrote:
Fact: Mushroom provides water and nutrients to the tree under which it grows.
Conclusion: Havesting mushrooms grow under the tree endangers the tree.

Ask for weekening.

(E) Young Douglas fir seedlings die without the nutrients and water provided by chanterelle filaments.
This strengthens the conclusion that havesting mushroom harms the trees.

So D.

How does that strengthen the conclusion. It says with mushrom chaterelle filaments providing nutrients and water, young douglas fir seedlings die. so harvesting musrooms does not endager the trees.

so E should be the correct choice.
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Re: CR Mushrooms [#permalink]

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22 Nov 2005, 13:40
joemama142000 wrote:
The chanterelle, a type of wild mushroom, grows beneath host trees such as the Douglas fir, which provide it with necessary sugars. The underground filaments of chanterelles, which extract the sugars, in turn provide nutrients and water for their hosts. Because of this mutually beneficial relationship, harvesting the chanterelles growing beneath a Douglas fir seriously endangers the tree.

Which of the following, if true, casts the most doubt on the conclusion drawn above?

(A) The number of wild mushrooms harvested has increased in recent years.

(B) Chanterelles grow not only beneath Douglas firs but also beneath other host trees.

(C) Many types of wild mushrooms are found only in forests and cannot easily be grown elsewhere.

(D) The harvesting of wild mushrooms stimulates future growth of those mushrooms.

(E) Young Douglas fir seedlings die without the nutrients and water provided by chanterelle filaments.

C-havesting(picking crops) or taking away the mushrooms will endanger the tree because they depend on each other.

If tree dies without mushrooms, then taking away the mushrooms will endanger the tree. Therefore, E strengthens the argument.

D weakens the argument by saying if you take away mushrooms, more mushrooms will grow under the tree, making it better for the tree. Therefore, taking awy the mushrooms will not endanger the tree. Thus it is correct.
Re: CR Mushrooms   [#permalink] 22 Nov 2005, 13:40
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