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One of the more reliable methods of determining regional climatic cond

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One of the more reliable methods of determining regional climatic cond  [#permalink]

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New post Updated on: 07 May 2018, 23:19
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A
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  85% (hard)

Question Stats:

44% (01:20) correct 56% (01:22) wrong based on 249 sessions

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One of the more reliable methods of determining regional climatic conditions in prehistoric periods is to examine plant pollen trapped in glacial ice during ancient times. By comparing such pollen samples with spores taken from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition. Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.

Which one of the following may be inferred from the information in the passage?

(A) The earth has undergone several glacial periods.
(B) Radiocarbon dating can be corroborated by glacial evidence.
(C) Similarities between prehistoric and contemporary climates do not exist.
(D) Pollen deposition is a fairly continuous process.
(E) Certain flora are reliably associated with particular climatic conditions.

Originally posted by vaivish1723 on 01 Jul 2009, 02:25.
Last edited by Bunuel on 07 May 2018, 23:19, edited 1 time in total.
Renamed the topic and edited the question.
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Re: One of the more reliable methods of determining regional climatic cond  [#permalink]

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New post 02 Jul 2009, 12:30
1
vaivish1723 wrote:
One of the more reliable methods of determining regional climatic conditions in prehistoric periods is to examine plant pollen trapped in glacial ice during ancient times. By comparing such pollen samples with spores taken from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition. Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.

Which one of the following may be inferred from the information in the passage?
(A) The earth has undergone several glacial periods.
(B) Radiocarbon dating can be corroborated by glacial evidence.
(C) Similarities between prehistoric and contemporary climates do not exist.
(D) Pollen deposition is a fairly continuous process.
(E) Certain flora are reliably associated with particular climatic conditions.


(A) We know info is extracted from current glaciers, we can't infer anything about "glacial periods".
(B) No, glacial evidence tell us the TYPE of climate, whereas carbon dating tell us WHEN that climate was prevalent.
(C) We don't know whether similarities exist, we only know the climates of the different periods can be compared.
(D) We don't know how "continuous" pollen is, we don't know how often we find it in the glaciers.

(E) By POE, this is the only choice left. We know we can determine climate by examining frozen prehistoric pollen from plants, so certain plants must be reliable indicators of what type of climate/weather existed in a given region.
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Re: One of the more reliable methods of determining regional climatic cond  [#permalink]

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New post 03 Jul 2009, 00:08
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Since this is an inference question, we need to select an option which the above argument suggests, but not explicitly given in the argument.

(A) The earth has undergone several glacial periods. - argument just talking about determining climatic condition. We don't know if earth has undergone several glacial periods
(B) Radiocarbon dating can be corroborated by glacial evidence. -argument just mentions about determining the period using radiocarbon dating
(C) Similarities between prehistoric and contemporary climates do not exist. - Argument actually says opposite of this "By comparing such pollen samples with spores taken from modern vegetation"
(D) Pollen deposition is a fairly continuous process. -I would say this is an assumption in the argument. If its not continuous process then scientists may not be able to determine climatic conditions in certain prehistoric periods.
(E) Certain flora are reliably associated with particular climatic conditions. -The argument says "One of the more reliable methods of ....", so we can infer this option.
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Re: CR -- One of the more reliable  [#permalink]

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New post 11 Feb 2010, 08:35
SudiptoGmat wrote:
One of the more reliable methods of determining regional climatic conditions in prehistoric periods is to examine plant pollen trapped in glacial ice during ancient times. By comparing such pollen samples with spores taken from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition. Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.
Which one of the following may be inferred from the information in the passage?
(A) The earth has undergone several glacial periods.
(B) Radiocarbon dating can be corroborated by glacial evidence.
(C) Similarities between prehistoric and contemporary climates do not exist.


Option A is too much of an inference, the passage does not discuss the possibility of several glacial periods. It only discusses that weather conditions might have been different.
Option C is too strong by saying that similarities do not exist at all. The passage only discusses how to compare weather conditions using pollen data.

Having eliminated two out of the three options given, I guess, I'll go with B. The additional premise that starts with "Furthermore" is a good indication that we are flowing in the proper direction.
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Re: CR -- One of the more reliable  [#permalink]

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New post 16 Apr 2010, 08:13
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(A) we can't infer about "glacial periods".
(B) carbon dating tell us WHEN that climate was prevalent not type of climate
(D) don't know how often we find it in the glaciers.

(E) By POE, this is the only choice left.

climate can be determined by examining frozen prehistoric pollen,
certain plants must be reliable indicators of climate/weather existed in given region.
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Re: CR -- One of the more reliable  [#permalink]

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New post 29 May 2010, 11:21
1
Lets solve this CR with the CR Bible strategies:

The structure of the argument is:
Premise + Conclusion + Additional Premise
(One of the more, by comparing) + (scientists can figure out) + furthermore

So, we can rearrnage the parts as:
Premise + Additional Premise + Conclusion

Premise: One of the more reliable methods of determining regional climatic conditions in prehistoric periods is to examine plant pollen trapped in glacial ice during ancient times.

Additional Premise: Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.

Conclusion:
Scientists can figure out approximately what the weather was like at the time of pollen deposition.

We can say an inference is like a Must be True statement based on the stimulus given. So, any answer choice rephrasing any of the above premise/additional premise/conclusion and avoiding new info will be the correct answer.

Now, lets check the given options:

(A) The earth has undergone several glacial periods. [No mention of Several glaciers. [New info based option. Incorrect]

(B) Radiocarbon dating can be corroborated by glacial evidence. [This is a Reverse case trap. Radiocarbon dating and glacial evidence are stated in the stimulus but in different context. Incorrect]

(C) Similarities between prehistoric and contemporary climates do not exist.
[This is Opposite case. Read the conclusion and additional premise. Incorrect]

(D) Pollen deposition is a fairly continuous process.
[No mention of such process. New info. Incorrect]]

(E) Certain flora are reliably associated with particular climatic conditions.
This is just the prephased version of the conclusion. Correct.

So, OA is E.
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Re: One of the more reliable methods of determining regional climatic cond  [#permalink]

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New post 25 Jan 2012, 10:52
Can someone please explain what I'm missing here?

The stimulus talks about examining plant pollen. (E) talks about flora. How can (E) be the correct answer????

IMO (B) is the correct answer because this is exactly what the stimulus says:

Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.
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Re: One of the more reliable methods of determining regional  [#permalink]

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New post 22 May 2012, 22:55
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+1 E

Choice E is correct because of this premise in the argument:

"By comparing such pollen samples with spores taken from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition".
So, certain type of polen is related with some climatic conditions.
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Re: One of the more reliable methods of determining regional climatic cond  [#permalink]

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New post 09 May 2018, 04:06
(A) The earth has undergone several glacial periods- Out of Scope
(B) Radiocarbon dating can be corroborated by glacial evidence-
(C) Similarities between prehistoric and contemporary climates do not exist- wrong conclusion
(D) Pollen deposition is a fairly continuous process- Inconsequential
(E) Certain flora are reliably associated with particular climatic conditions- inference drawn from the premises as the whole passage is dependent on the fact that pollen from floras can indicate climate.
Re: One of the more reliable methods of determining regional climatic cond &nbs [#permalink] 09 May 2018, 04:06
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