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

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VP
Joined: 18 Nov 2004
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The chanterelle, a type of wild mushroom, grows beneath host [#permalink]

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08 May 2005, 20:13
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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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VP
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08 May 2005, 21:21
(D) The harvesting of wild mushrooms stimulates future growth of those mushrooms.
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08 May 2005, 23:54
I'd choose D.

A B and C are irrelevant.
E supports the conclusion drawn.
D is the only statement that casts the most doubts on the conclusion drawn - harvesting mushrooms spurs their growth, and therefore cannot be harmful for the trees - because it provides a further thrust to the symbiotic relationship.
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VP
Joined: 18 Nov 2004
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09 May 2005, 04:19
I don't understand the conclusion in BF. If they are mutually beneficial then how is the stem concluding that this relationship actually endangers the tree. Can someone explain. Also "D" is not the OA.

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.
VP
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09 May 2005, 04:53
it must be D). all other choices are wrong. D) clearly weakens the conclusion that the removal of the chanterelle endangers the tree, because it loses its beneficial counterpart. D) says that the removal benefits the growth of new mushrooms and so the mutually beneficial relationship is maintained. the tree will still recieve water and nutrients from an even greater number of mushrooms.
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VP
Joined: 18 Nov 2004
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09 May 2005, 05:29
c**p.....missed such a simple CR. Yes, I double checked the OA it is "D". I kept thinking that "harvesting" means growing more mushrooms, so the whole stem didn't make any logical sense to me. Now it is clear. Thx !
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10 May 2005, 01:49
(D) for me too
10 May 2005, 01:49
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