Find all School-related info fast with the new School-Specific MBA Forum

It is currently 15 Apr 2014, 20:35

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Amphibian populations are declining in numbers worldwide.

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
VP
VP
Joined: 26 Apr 2004
Posts: 1226
Location: Taiwan
Followers: 2

Kudos [?]: 28 [0], given: 0

GMAT Tests User
Amphibian populations are declining in numbers worldwide. [#permalink] New post 02 Sep 2004, 03:00
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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.
Manager
Manager
Joined: 02 Jul 2004
Posts: 218
Followers: 1

Kudos [?]: 1 [0], given: 0

GMAT Tests User
Re: CR39 [#permalink] New post 02 Sep 2004, 04:08
chunjuwu 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.


I believe it's A

B shows that UV-B is indeed the factor - those who have protection from UV-B are doing better than those who do not

C establishes a correlation by territory between the depletion of the ozone layer and the decline in amphibian population - those who leave in dangerous zones suffer more than those who do not

D rules out an alternative reason why amphibian population could decline

E establishes a correlation by time between the depletion of the ozone layer and the decline in amphibian population - the decline began at the same time as the depletion

A is rather neutral for the argument
Manager
Manager
Joined: 26 Jul 2004
Posts: 53
Followers: 1

Kudos [?]: 0 [0], given: 0

cR39 [#permalink] New post 02 Sep 2004, 04:13
Yes you are right. Thinking again, I tend to agree with A.
GMAT Club Legend
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4318
Followers: 16

Kudos [?]: 123 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2004, 04:26
Agree with A although D was a good catch.
_________________

Best Regards,

Paul

Senior Manager
Senior Manager
User avatar
Affiliations: CFA Level 2
Joined: 05 May 2004
Posts: 267
Location: Hanoi
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2004, 06:06
I pick D though I see no reason to dismiss A.
_________________

"Life is like a box of chocolates, you never know what you'r gonna get"

SVP
SVP
User avatar
Joined: 16 Oct 2003
Posts: 1818
Followers: 3

Kudos [?]: 26 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2004, 06:55
I forgot about the 50 years in the passage and so choose E as my answer. I think it should be A.
GMAT Club Legend
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4318
Followers: 16

Kudos [?]: 123 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2004, 07:00
bigtooth81 wrote:
I pick D though I see no reason to dismiss A.

If amphibians' natural habitat shrunk, then the decline in their number could be attributed to that particular reason instead of the UVB. Since their natural habitat's size remained intact, it strengthens the argument that some other reason, possibly UVB, must be the cause of amphibians' extinction
_________________

Best Regards,

Paul

Senior Manager
Senior Manager
User avatar
Joined: 16 Aug 2004
Posts: 329
Location: India
Followers: 1

Kudos [?]: 37 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2004, 10:30
My answer is D. The reason is as under stated.
Conclusion: Ambhibian population is declining due to Decrease in Ozone Layer
Evidence/Support: UV rays damage the genes, Ozone blocks UV rays
Evidence/Support: Ambhibian lack hair and other covering on their body and eggs and therefore more prone to UV rays.

Now
(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes.
....damage genes and therefore decline in polulation. It strenghtens

(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.
....By 2nd evidence strengthens

(C) Atmospheric ozone has been significantly depleted above all the areas of the world in which amphibian populations are declining.
.... strenghtens

(D) The natural habitat of amphibians has not become smaller over the past century.
... This provides nothing to the conclusion that
Ambhibian population is declining due to Decrease in Ozone Layer

(E) Amphibian populations have declined continuously for the last 50 years.
...Ozone has been depleting for last 50 years therefore strenghtens.

Hence D
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5099
Location: Singapore
Followers: 15

Kudos [?]: 120 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2004, 16:53
(A) Of the various types of radiation blocked by atmospheric ozone,
UV-B is the only type that can damage genes.
- If that is the case, all speicies would be affected.

(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.
- Strengthens the claim UV-B affects amphibians more than nonamphibian species

(C) Atmospheric ozone has been significantly depleted above all the
areas of the world in which amphibian populations are declining.
- If the ozone layer is more deleted above areas where amphibian populatio is declining, then UV-B may be killing them

(D) The natural habitat of amphibians has not become smaller over the
past century.
- then they are not driven. Something else is causing a decline. Might be UV-B, migth be increase in population of their natural predators.

(E) Amphibian populations have declined continuously for the last
50 years.
- same timeline as ozone depletion
Manager
Manager
Joined: 11 Jul 2004
Posts: 120
Followers: 1

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 02 Sep 2004, 17:15
i get how b, c, d, e strenghten but can someone please explain why A is nuetral or does not strengthen. to me it looks good as it says uvb is bad
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5099
Location: Singapore
Followers: 15

Kudos [?]: 120 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2004, 17:47
(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes.

A is not very good as the radiation could be equally damaging to all species.
VP
VP
Joined: 26 Apr 2004
Posts: 1226
Location: Taiwan
Followers: 2

Kudos [?]: 28 [0], given: 0

GMAT Tests User
 [#permalink] New post 03 Sep 2004, 08:11
Thank you, all

As ywilfred said, the OA is (D).

D is the least strengthened answer.

In choice A, can we said that there were indeed a radition called UV-B which had been blocked by atmospheric ozone and now it endangered the amphibilian because of the depletion of the ozone layer?

Last edited by chunjuwu on 04 Sep 2004, 08:36, edited 1 time in total.
GMAT Club Legend
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4318
Followers: 16

Kudos [?]: 123 [0], given: 0

GMAT Tests User
 [#permalink] New post 03 Sep 2004, 08:34
Nice catch ywilfred! :P
_________________

Best Regards,

Paul

Manager
Manager
Joined: 22 Feb 2004
Posts: 50
Location: Seoul, South Korea
Followers: 1

Kudos [?]: 0 [0], given: 0

 [#permalink] New post 06 Oct 2004, 21:59
chunjuwu, are you sure the OA is D?

My GMAT material says that the OA is A.

The reason is exaplained by OlegC and Pall.
Manager
Manager
Joined: 21 Aug 2004
Posts: 136
Followers: 1

Kudos [?]: 5 [0], given: 0

 [#permalink] New post 06 Oct 2004, 22:36
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.

A strengthens the argument becasue it establishes the point that is UV-B that causes the depletion and not any other chemicals otherwise blocked by the atmospheric ozone.

D is the odd one out and it shd be the answer.
  [#permalink] 06 Oct 2004, 22:36
    Similar topics Author Replies Last post
Similar
Topics:
Popular new posts Amphibian populations are declining in numbers worldwide. gmataquaguy 14 03 Aug 2005, 04:03
New posts Amphibian populations are declining in numbers worldwide. vshaunak@gmail.com 8 06 Jul 2007, 01:45
Popular new posts 3 Experts publish their posts in the topic Amphibian populations are declining in numbers worldwide. huntgmat 34 12 Jul 2008, 03:53
New posts Amphibian populations are declining in numbers worldwide. rampuria 3 03 Oct 2008, 04:38
Popular new posts Experts publish their posts in the topic Amphibian populations are declining in numbers worldwide. Vineetk 11 19 Nov 2012, 01:13
Display posts from previous: Sort by

Amphibian populations are declining in numbers worldwide.

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.