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by rahul.s » Sun Feb 07, 2010 1:42 am
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.

OA: A
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by hrishi19884 » Sun Feb 07, 2010 2:32 am
rahul.s 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.

OA: A
I would go about this question as below.

First and the foremost we have to support the reason for amphibian population depletion
which is "primary cause of the declining amphibian population is the depletion of the ozone layer"

check each option whether it would help to reach to the above reason as correct.

B - talks about -protection from UV rays(this states that ozone is declining) ---supports reason

C- directly refers "depletion of ozone" -supports reason

D -This proves that "natural habitat" is not the cause -supports reason

E - It says ozono has depleted from past 50 years and so is the amphibian population (so there is a connection with ozone depletion and population) --supports reasons

A - "UV-B is the only type that can damage genes" - is unrelated to the reason.
If in this case, we are not given that "damage of genes" can cause depletion of amphibian population. But its the depletion of ozone layer. --does not support reason


Hence it's A
Hrishi

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by komal » Sun Feb 07, 2010 10:22 am
rahul.s 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.
Correct : The primary cause of the declining amphibian population is the depletion of ozone layer and not UV-B. Hence Eliminated.

(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.
Incorrect : This strengthens the argument by implying that amphibians' eggs are harmed more by uv-b rays

(C) Atmospheric ozone has been significantly depleted above all the areas of the world in which amphibian populations are declining.
Incorrect : Strengthens the argument by supporting the connection between Ozone Layer and declining Amphibian population

(D) The natural habitat of amphibians has not become smaller over the past century.
Incorrect : Strengthens the argument by eliminating any other cause (natural habitat) of the stated effect (declining amphibian population)

(E) Amphibian populations have declined continuously for the last 50 years.
Incorrect : Strengthens the argument by reaffirming that amphibian populations have been declining since the time ozone layer has started depleting.

Hope this helps : )
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by onedayi'll » Sun Feb 07, 2010 4:26 pm
I'll go with A,
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by joseph32 » Sun May 15, 2016 10:57 pm
I agree with you guys. I also think that the right answer is A.
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