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# Some plants have extremely sensitive biological

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Some plants have extremely sensitive biological [#permalink]

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26 Sep 2010, 10:27
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Some plants have extremely sensitive biological thermometers. For example, the leaves of rhododendrons curl when the temperature of the air around them is below 0℃(Celsius). Similarly, mature crocus blossoms open in temperatures above 2℃. So someone who simultaneously observed rhododendrons with uncurled leaves, crocuses with mature but unopened blossoms, and a thermometer showing 1℃ could determine that the thermometer’s reading was accurate to within plus or minus 1℃.
Which one of the following, if true, most seriously undermines the reasoning above?
(A) Neither rhododendrons nor crocuses bloom for more than a few weeks each year, and the blossoms of rhododendrons growing in any area do not appear until at least several weeks after crocuses growing in that area have ceased to bloom.
(B) Many people find it unpleasant to be outdoors for long periods when the temperature is at or about 1℃.
(C) The climate and soil conditions that favor the growth of rhododendrons are also favorable to the growth of crocuses.
(D) Air temperature surrounding rhododendrons, which can grow 12 feet tall, is likely to differ from air temperature surrounding crocuses, which are normally only a few inches high, by more than 1℃, even if the two plants are growing side by side.
(E) Certain types of thermometers that are commonly used to measure outdoor temperatures can be extremely accurate in moderate temperature ranges but much less accurate in warmer or colder temperature range.
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26 Sep 2010, 11:55
I think D is the correct answer.
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27 Sep 2010, 02:06
stimulus
the leaves of rhododendrons curl when the temperature of the air around them is below 0℃(Celsius).
mature crocus blossoms open in temperatures above 2℃

conclusion
Someone who simultaneously observed rhododendrons with uncurled leaves, crocuses with mature but unopened blossoms, and a thermometer showing 1℃ could determine that the thermometer’s reading was accurate to within plus or minus 1℃.

to weaken the conclusion we have to show that the temperature shown by the thermometer is not accurate
D correctly points out that the surrounding temp of rhododendrons can differ from the surrounding temp of crocuses by more than 1℃.

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27 Sep 2010, 04:27
IMO A.
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27 Sep 2010, 07:25
The answer should be D. It cannot be A as in that, they are talking about blooming of rhododendrons which is not the case. Whether they bloom or not, the leaves will be present when the crocuses bloom.
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27 Sep 2010, 08:39
+1 D
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27 Sep 2010, 09:57
I went for D, what's the OA?

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27 Sep 2010, 12:18
What is the OA? I am going with D. Observing those two plants or whatever cannot determine whether or not the thermeter is accurate since the temperature surrounding those observations IS LIKELY (stated in the stimulus) to be different. metallica, thanks for the explanation.
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27 Sep 2010, 12:38
Maybe true, but out of scope (A) Neither rhododendrons nor crocuses bloom for more than a few weeks each year, and the blossoms of rhododendrons growing in any area do not appear until at least several weeks after crocuses growing in that area have ceased to bloom.

Irrelevant (B) Many people find it unpleasant to be outdoors for long periods when the temperature is at or about 1℃.

Irrelevant (C) The climate and soil conditions that favor the growth of rhododendrons are also favorable to the growth of crocuses.

Correct. The height difference between the 2 can definitely result in different temperatures that they are exposed to. The only way that makes any sense to undermine the statement (D) Air temperature surrounding rhododendrons, which can grow 12 feet tall, is likely to differ from air temperature surrounding crocuses, which are normally only a few inches high, by more than 1℃, even if the two plants are growing side by side.

Maybe true, but irrelevant (E) Certain types of thermometers that are commonly used to measure outdoor temperatures can be extremely accurate in moderate temperature ranges but much less accurate in warmer or colder temperature range.
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27 Sep 2010, 18:06
it has to be D....the closest Answer (A) Neither rhododendrons nor crocuses bloom for more than a few weeks each year, and the blossoms of rhododendrons growing in any area do not appear until at least several weeks after crocuses growing in that area have ceased to bloom.
We are dealing with the rhododendrons curling not the blossoms. Totally out of scope...what is OA?

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28 Sep 2010, 11:21
D

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29 Sep 2010, 10:30
I'll go for D

noboru wrote:
Some plants have extremely sensitive biological thermometers. For example, the leaves of rhododendrons curl when the temperature of the air around them is below 0℃(Celsius). Similarly, mature crocus blossoms open in temperatures above 2℃. So someone who simultaneously observed rhododendrons with uncurled leaves, crocuses with mature but unopened blossoms, and a thermometer showing 1℃ could determine that the thermometer’s reading was accurate to within plus or minus 1℃.
Which one of the following, if true, most seriously undermines the reasoning above?
(A) Neither rhododendrons nor crocuses bloom for more than a few weeks each year, and the blossoms of rhododendrons growing in any area do not appear until at least several weeks after crocuses growing in that area have ceased to bloom. The question states that they are in bloom so this is out
(B) Many people find it unpleasant to be outdoors for long periods when the temperature is at or about 1℃. Has nothing to do with what the question is asking
(C) The climate and soil conditions that favor the growth of rhododendrons are also favorable to the growth of crocuses. Again nothing to do with the temperature
(D) Air temperature surrounding rhododendrons, which can grow 12 feet tall, is likely to differ from air temperature surrounding crocuses, which are normally only a few inches high, by more than 1℃, even if the two plants are growing side by side. CORRECT since it explains how the temp could vary more than 1℃
(E) Certain types of thermometers that are commonly used to measure outdoor temperatures can be extremely accurate in moderate temperature ranges but much less accurate in warmer or colder temperature range. Again does not answer any part of the question. Irrelevant

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29 Sep 2010, 13:54
Can you share the OA please?
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29 Sep 2010, 15:17
Quote:
Its your duty to post OA afterwards; some one must be waiting for that...

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29 Sep 2010, 16:29
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03 Oct 2010, 15:43
D for me.
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03 Oct 2010, 15:47
Somebody in 2005 on other forum said the OA is D.
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Re: sensitive biological thermometers   [#permalink] 03 Oct 2010, 15:47
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