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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
 02 Sep 2010, 02:18
D as well
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
02 Sep 2010, 07:31
E seems correct
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
06 Sep 2010, 11:39
A bit confusing
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
13 Jul 2011, 03:05
The answer can be obtained by POE.
(D) is incorrect because it strengthens the argument by eliminating another potential cause of the decrease in the amphibian populations.
However, it is interesting to understand why A doesn't strengthen the argument. Here's my reasoning:
(A) This answer does not strengthen the argument because:
- We know that ozone layer blocks UV-B radiation
- We know that amphibians are particularly vulnerable to UV-B radiation (i.e., they are not so vulnerable to other forms of radiation => other forms of radiation are not central to the well-being of amphibians).
Therefore, the fact that out of various forms of radiation blocked by the ozone layer UV-B is the only one that can damage genes adds nothing new to the argument (it only re-states that UV-B radiation is harmful to genes). Consequently, this information doesn’t strengthen the argument.
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
13 Jul 2011, 08:19
I am thinking on exactly the same lines as nandini11. Can anyone please explain why A and why not D?
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
25 Sep 2011, 04:05
hemanthp wrote: It is not D. It is A.
D - If the natural habitat has not become small then it actually means that "lack of habitat" is not the reason and it kind of points out that UV rays might have well killed them despite the natural habitat being more or less intact.
A - It states the info already given. UV-B causes damage is a premise. A states that UV-B is the only radiation blocked by Ozone that causes damage. Even if it blocks any other radiation ... which causes cell damage, that info is not pertinent here.
Let me know if the explanation makes no sense.
Thank you. Arigatho sensei!!....this really cleared things up for me..
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
26 Sep 2011, 07:21
huntgmat wrote: Amphibian populations are declining in numbers worldwide. Not coincidentally, the earth’s ozone
layer has been continuously depleted throughout the last 50 years. Atmospheric ozone blocks UV-B, a type of ultraviolet radiation that is continuously produced by the sun, and which can damage genes. Because amphibians lack hair, hide, or feathers to shield them, they are particularly vulnerable to UV-B radiation. In addition, their gelatinous eggs lack the protection of leathery or hard shells. Thus, the primary cause of the declining amphibian population is the depletion of the ozone layer.
Each of the following, if true, would strengthen the argument EXCEPT:
(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes.
(B) Amphibian populations are declining far more rapidly than are the populations of nonamphibian species whose tissues and eggs have more natural protection from
UV-B.
(C) Atmospheric ozone has been significantly depleted above all the areas of the world in
which amphibian populations are declining.
(D) The natural habitat of amphibians has not become smaller over the past century.
(E) Amphibian populations have declined continuously for the last 50 years. Tricky one X --> Y (Premise, i.e. X causes Y) If, we are given a statement that shows Z -->Y (i.e. Z also causes Y), then this statement will weaken the argument. Hence OA should be A.
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
26 Sep 2011, 14:00
I love EXCEPT and LEAST Ques's..Thanks for posting... In this type of ques we have 4 Strengthening Answer choices which are incorrect. And 1 Not strengthening choice( could be weakening or may have no impact on the stimulus). Lets shoot the answer choices now........ Each of the following, if true, would strengthen the argument EXCEPT: (A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes. Oh this is the Correct one...It has no impact on the stimulus(B) Amphibian populations are declining far more rapidly than are the populations of nonamphibian species whose tissues and eggs have more natural protection from UV-B. Strengthening(C) Atmospheric ozone has been significantly depleted above all the areas of the world in Strengtheningwhich amphibian populations are declining. (D) The natural habitat of amphibians has not become smaller over the past century. This is the sugar coated shell game answer(E) Amphibian populations have declined continuously for the last 50 years. Strengthening
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
26 Sep 2011, 21:56
prateekbhatt wrote: I love EXCEPT and LEAST Ques's..Thanks for posting...
In this type of ques we have 4 Strengthening Answer choices which are incorrect. And 1 Not strengthening choice( could be weakening or may have no impact on the stimulus).
Lets shoot the answer choices now........
Each of the following, if true, would strengthen the argument EXCEPT:
(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes. Oh this is the Correct one...It has no impact on the stimulus
(B) Amphibian populations are declining far more rapidly than are the populations of nonamphibian species whose tissues and eggs have more natural protection from
UV-B. Strengthening
(C) Atmospheric ozone has been significantly depleted above all the areas of the world in Strengthening
which amphibian populations are declining.
(D) The natural habitat of amphibians has not become smaller over the past century. This is the sugar coated shell game answer
(E) Amphibian populations have declined continuously for the last 50 years.Strengthening I would still go with E. Like other I was also split between A and E and chose E. A still has impact on stimulus as : UV B damages genes ---> UV B is absorbed by ozone ----> when ozone is depleted, UV B will not be absorbed and hence the genes will be damaged. I think E has no impact. E just states that the population has been declining for 50 years. reasons- dnt know. E is just stating a fact and fails to establish any relationship. Am I going wrong somewhere??
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
27 Sep 2011, 12:29
GMATmission wrote: prateekbhatt wrote: I love EXCEPT and LEAST Ques's..Thanks for posting...
In this type of ques we have 4 Strengthening Answer choices which are incorrect. And 1 Not strengthening choice( could be weakening or may have no impact on the stimulus).
Lets shoot the answer choices now........
Each of the following, if true, would strengthen the argument EXCEPT:
(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes. Oh this is the Correct one...It has no impact on the stimulus
(B) Amphibian populations are declining far more rapidly than are the populations of nonamphibian species whose tissues and eggs have more natural protection from
UV-B. Strengthening
(C) Atmospheric ozone has been significantly depleted above all the areas of the world in Strengthening
which amphibian populations are declining.
(D) The natural habitat of amphibians has not become smaller over the past century. This is the sugar coated shell game answer
(E) Amphibian populations have declined continuously for the last 50 years.Strengthening I would still go with E. Like other I was also split between A and E and chose E. A still has impact on stimulus as : UV B damages genes ---> UV B is absorbed by ozone ----> when ozone is depleted, UV B will not be absorbed and hence the genes will be damaged. I think E has no impact. E just states that the population has been declining for 50 years. reasons- dnt know. E is just stating a fact and fails to establish any relationship. Am I going wrong somewhere?? (A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes. It is talking about diffrent UV B rays....And comparing all....Dosent strengthen the stimulus at all..Because we dont want to know what all UV B rays are dangerous... Therefore does not have any impact on the stimulus.....
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Re: CR : Amphibian populations are declining in numbers worldwid [#permalink]
27 Sep 2011, 22:12
D really tricked me. Its really A. Awesome-st Question.Loved it 
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Re: CR : Amphibian populations are declining in numbers worldwid
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27 Sep 2011, 22:12
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