|
Author |
Message |
|
TAGS:
|
|
|
Manager
Joined: 21 Aug 2006
Posts: 148
Followers: 2
Kudos [?]:
16
[1] , given: 0
|
Learning how to build a nest plays an important part in the [#permalink]
 01 Feb 2008, 00:06
1
This post received
KUDOS
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
Learning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience. Which one of the following, if true, would most weaken the argument? (A) Blackbirds build better nests than other birds. (B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction. (C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time. (D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds. (E) Up to 25 percent of all birds are killed by predators before they start to nest. Can somebody explain the correct answer pls
_________________
Neelabh Mahesh
|
|
|
|
|
|
|
Intern
Joined: 14 Dec 2007
Posts: 4
Followers: 0
Kudos [?]:
3
[1] , given: 0
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 12:46
1
This post received
KUDOS
E .. by POE
A) Blackbirds build better nests than other birds. not relevant, as to how better they can build than others
(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.capacity to lay eggs is not important here, its the experience of nesting
(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.this will strengthen it, its already there in the argument
(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.strengthens the argument, as it talks of stronger black birds .. still need experience in nesting
(E) Up to 25 percent of all birds are killed by predators before they start to nest.
|
|
|
|
|
|
Manager
Joined: 18 May 2007
Posts: 56
Followers: 1
Kudos [?]:
17
[1] , given: 0
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 13:39
1
This post received
KUDOS
I think it is B since it proves that it is not nesting that is a factor in successful breeding but the capacity of the blackbirds to lay viable eggs that increases with time.
E has no releavance to either nesting or breeding.
|
|
|
|
|
|
Manager
Joined: 02 Feb 2007
Posts: 120
Followers: 1
Kudos [?]:
10
[1] , given: 0
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 13:48
1
This post received
KUDOS
This is the last sentence of the argument, which is also the conclusion. "It is difficult to avoid the conclusion that they benefit by their nesting experience."
To weaken it we have to prove that the more they do it the better they get at it, which is in fact answer B.
|
|
|
|
|
|
Senior Manager
Joined: 06 Jul 2006
Posts: 295
Location: SFO Bay Area
Schools: Berkeley Haas
Followers: 1
Kudos [?]:
26
[1] , given: 0
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 18:20
1
This post received
KUDOS
I would second B as well. Coz here its trying to prove that its some other factor which is important and not nesting. Whats OA ?
_________________
-------------------------------------------------------------
When you come to the end of your rope, tie a knot and hang on.
|
|
|
|
|
|
Senior Manager
Joined: 26 Jan 2008
Posts: 267
Followers: 2
Kudos [?]:
58
[1] , given: 1
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 18:46
1
This post received
KUDOS
neelabhmahesh wrote: Learning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience.
Which one of the following, if true, would most weaken the argument?
(A) Blackbirds build better nests than other birds.
(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.
(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.
(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.
(E) Up to 25 percent of all birds are killed by predators before they start to nest.
Can somebody explain the correct answer pls (B)
_________________
My GMAT debrief
|
|
|
|
|
|
Intern
Joined: 11 Oct 2007
Posts: 38
Followers: 0
Kudos [?]:
4
[1] , given: 0
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 19:14
1
This post received
KUDOS
neelabhmahesh wrote: Learning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience.
Which one of the following, if true, would most weaken the argument?
(A) Blackbirds build better nests than other birds.
(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.
(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.
(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.
(E) Up to 25 percent of all birds are killed by predators before they start to nest.
Can somebody explain the correct answer pls Is OA D? I think A, B and E are irrelevant. C is strengthen the argument. I cannot explain why D is the best choice, but I pick it after eliminating the rest. However, it is said "This cannot be a mere matter of size and strength", thus, I think D is relevant to the answer. Is it right?
|
|
|
|
|
|
SVP
Joined: 04 May 2006
Posts: 1946
Schools: CBS, Kellogg
Followers: 10
Kudos [?]:
168
[1] , given: 1
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 19:40
1
This post received
KUDOS
neelabhmahesh wrote: Learning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience.
Which one of the following, if true, would most weaken the argument?
(A) Blackbirds build better nests than other birds.
(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.
(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.
(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.
(E) Up to 25 percent of all birds are killed by predators before they start to nest.
Can somebody explain the correct answer pls For me E should be the OA! Let see: Blackbird can not be a representative of birds in general. So anything true for Blackbird is not neccessarily true for the other kinds of bird. Blackbird: if success in nesting, then success in breeding. Other birds(E says)were killed before breeding. Thats why they are not more succeeful in breeding than Blackbird.
_________________
Find out what's new at GMAT Club - latest features and updates
|
|
|
|
|
|
Senior Manager
Joined: 07 Jan 2008
Posts: 321
Location: Ann Arbor, Michigan
Schools: Ross Class of 2011
Followers: 4
Kudos [?]:
60
[1] , given: 0
|
Re: CR: Bird nesting [#permalink]
03 Feb 2008, 19:56
1
This post received
KUDOS
My vote is B - for reasons mentioned above. While it's not the strongest answer it's the best of the evils.
|
|
|
|
|
|
Manager
Joined: 07 Jan 2008
Posts: 114
Followers: 1
Kudos [?]:
16
[1] , given: 0
|
Re: CR: Bird nesting [#permalink]
05 Feb 2008, 14:14
1
This post received
KUDOS
B it is. As it provides the most effective alternate explanation for the breeding success.
|
|
|
|
|
|
Manager
Joined: 02 Feb 2007
Posts: 120
Followers: 1
Kudos [?]:
10
[0], given: 0
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 13:44
I go with B also by POE.
|
|
|
|
|
|
CEO
Joined: 17 Nov 2007
Posts: 3591
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 230
Kudos [?]:
1298
[0], given: 346
|
Re: CR: Bird nesting [#permalink]
01 Feb 2008, 14:01
BLearning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience. Assumption: There is no other cause resulting in more success in breeding for older birds.Which one of the following, if true, would most weaken the argument? (A) Blackbirds build better nests than other birds. - irrelevant.(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction. - break our assumption(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time. - paraphrasing of the evidence.(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds. - paraphrasing of the evidence.(E) Up to 25 percent of all birds are killed by predators before they start to nest. - irrelevant.
_________________
iPhone/iPod/iPad: GMAT ToolKit - The bestselling GMAT prep app | GMAT Club (free) | PrepGame | GRE ToolKit | LSAT ToolKit
Android: GMAT ToolKit (NEW!). POLL: What tool do you need next?
Math: GMAT Math Book ||| General: GMATTimer ||| Chicago Booth: Slide Presentation
The People Who Are Crazy Enough to Think They Can Change the World, Are the Ones Who Do.
Find out what's new at GMAT Club - latest features and updates
|
|
|
|
|
|
CEO
Joined: 29 Mar 2007
Posts: 2618
Followers: 13
Kudos [?]:
142
[0], given: 0
|
Re: CR: Bird nesting [#permalink]
02 Feb 2008, 20:54
Seems to be B. This is a tough one.
|
|
|
|
|
|
Director
Joined: 30 Jun 2007
Posts: 793
Followers: 1
Kudos [?]:
82
[0], given: 0
|
Re: CR: Bird nesting [#permalink]
03 Feb 2008, 16:56
Conclusion: Learning how to build a nest plays an important part in the breeding success of birds. It is difficult to avoid the conclusion that they benefit by their nesting experience.
In order to weaken the argument, introduce answer choice that either indicates breeding success is independent of building nests or introduces irrelevant answer choice.
(A) Blackbirds build better nests than other birds.[Any other birds is not discussed as part of the argument – eliminate it]
(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.[Hold it]
(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.[This choice strengthen the argument – eliminate it]
(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.[The comparison of smaller and bigger birds has nothing to do with the conclusion – eliminate it]
(E) Up to 25 percent of all birds are killed by predators before they start to nest.[Predators attack is outside the scope of the argument – eliminate it]
Answer: B
|
|
|
|
|
|
Manager
Joined: 21 Aug 2006
Posts: 148
Followers: 2
Kudos [?]:
16
[0], given: 0
|
Re: CR: Bird nesting [#permalink]
06 Feb 2008, 06:39
OA is B.
_________________
Neelabh Mahesh
|
|
|
|
|
|
|
Re: CR: Bird nesting
[#permalink]
06 Feb 2008, 06:39
|
|
|
|
|
|
|
|
|
|
Moderators:
metallicafan, rajeevrks27, souvik101990, PTK, MacFauz, noboru, kissthegmat, carcass, willigetmylifeback, mikemcgarry, doe007, Vercules, Legendaddy, tuanquang269, RaviChandra, Marcab, Narenn
|
close
