The prairie vole, a small North American grassland rodent, : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 20 Jan 2017, 13:24

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# The prairie vole, a small North American grassland rodent,

Author Message
TAGS:

### Hide Tags

Manager
Joined: 24 Apr 2008
Posts: 56
Followers: 2

Kudos [?]: 93 [0], given: 0

The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

26 Apr 2008, 08:03
6
This post was
BOOKMARKED
00:00

Difficulty:

15% (low)

Question Stats:

76% (02:03) correct 24% (01:08) wrong based on 592 sessions

### HideShow timer Statistics

The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through to winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by seasonal variation in mortality among young voles.

Which of the following, if true, provides the strongest support for the explanation offered ?

A. It is in the spring and early summer that prairie vole communities generally contain the highest proportion of young voles.

B. Prairie vole populations vary dramatically in size from year to year.

C. The prairie vole subsists primarily on broad-leaved plants that are abundant only in spring.

D. Winters in the prairie voles' habitat are often harsh, with temperatures that drop well below freezing.

E. Snakes, a major predator of young prairie voles, are active only from spring through early autumn.

Source: GMATPrep CR PDF
[Reveal] Spoiler: OA

Last edited by TGC on 04 Sep 2014, 20:38, edited 2 times in total.
If you have any questions
New!
Director
Joined: 12 Oct 2008
Posts: 554
Followers: 3

Kudos [?]: 424 [1] , given: 2

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 06:20
1
KUDOS
The prairle vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.

Which of the followings, if true, provides the strongest support for the explanation offered?

1. It is in the spring and early summer that prairle vole communities generally contain the highest proportion of young voles.
2. Prairle vole populations vary dramatically in size from year to year
3. The prairle vole subsists primarily on bread-leaved plants that are abundant only in spring
4. Winters in the prairle voles’ habitat are often harsh, with temperatures that drop well below freezing.
5. Snakes, a major predator of young prairle vole, are active only from spring through early summer
VP
Status: Far, far away!
Joined: 02 Sep 2012
Posts: 1123
Location: Italy
Concentration: Finance, Entrepreneurship
GPA: 3.8
Followers: 181

Kudos [?]: 1965 [1] , given: 219

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

23 Jul 2013, 07:06
1
KUDOS
1
This post was
BOOKMARKED
jaituteja wrote:
OA is E...Why are other options wrong??
Can someone explain...!!!!

We have to provide support to the claim:
The seasonal variation in group size can probably be explained by seasonal variation in mortality among young voles.
We have to connect seasonal variation==> seasonal variation in mortality somehow (also note that the conclusion talks about "among young voles").
Winter = high
Spring through early autumn = low

A. It is in the spring and early summer that prairie vole communities generally contain the highest proportion of young voles.
This goes against the passage, who says that in spring the young voles should diminish.
B. Prairie vole populations vary dramatically in size from year to year.
By how much the size varies does not helps us in establishing our point.
C. The prairie vole subsists primarily on broad-leaved plants that are abundant only in spring.
Keep an eye on the conclusion we are trying to prove: our focus must be on the young voles.
We can infer something like "so the population is likely to increase in spring" reading C, which anyway is against the passage.
D. Winters in the prairie voles' habitat are often harsh, with temperatures that drop well below freezing.
Keep in mind that during winter the number are higher and during spring through early autumn the numbers are lower. If we know that despite harsh condition the population grows, we still do not have anything to connect YOUNG VOLES to the seasonal variation in mortality.
E. Snakes, a major predator of young prairie voles, are active only from spring through early autumn.
Look at E: it has all the key words (young prairie voles, spring through early autumn) and supports our conclusion stated above.

Snakes, a major predator of young prairie voles, are active only from spring through early autumn. => so during this period it feeds on young voles mainly, so we have connected
seasonal variation in group size ==> seasonal variation in mortality among young voles.
_________________

It is beyond a doubt that all our knowledge that begins with experience.

Kant , Critique of Pure Reason

Tips and tricks: Inequalities , Mixture | Review: MGMAT workshop
Strategy: SmartGMAT v1.0 | Questions: Verbal challenge SC I-II- CR New SC set out !! , My Quant

Rules for Posting in the Verbal Forum - Rules for Posting in the Quant Forum[/size][/color][/b]

Senior Manager
Joined: 07 Jan 2008
Posts: 412
Followers: 3

Kudos [?]: 217 [0], given: 0

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

26 Apr 2008, 09:59
Manager
Joined: 27 Mar 2008
Posts: 99
Followers: 1

Kudos [?]: 11 [0], given: 0

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

27 Apr 2008, 00:35
I say E.

The argument implies that the variation in group size is related to the mortality rate in young voles. The groups are smallest from spring to early autumn. If snakes that eat young voles are only active from spring to early autumn, this would cause smaller groups during that time due to the fact that young voles are dying (being eaten). Therefore, this would support the argument.
_________________

MBA Blog: University of Minnesota Carlson School of Management- http://unconventionalapplicant.blogspot.com/

Current Student
Joined: 17 Jan 2008
Posts: 586
Location: Ann Arbor, MI
Schools: Ross '12 (MBA/MS)
Followers: 2

Kudos [?]: 126 [0], given: 34

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

27 Apr 2008, 01:26
Why do prarie vols live in smaller groups from spring through early autumn? They get eaten by snakes!

_________________
Manager
Joined: 24 Apr 2008
Posts: 56
Followers: 2

Kudos [?]: 93 [0], given: 0

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

27 Apr 2008, 09:29
CEO
Joined: 17 May 2007
Posts: 2989
Followers: 60

Kudos [?]: 581 [0], given: 210

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

27 Apr 2008, 22:45
Another E.
Director
Joined: 04 Jan 2008
Posts: 912
Followers: 69

Kudos [?]: 572 [0], given: 17

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 06:33
Friend, One Request
pls mention GPREP Q in subject line(If you are knowingly posting GPrep Q)

Btw,good Q indeed
we have to justify/support the explanation here
How the seasonal variation in mortality among young voles??

Its D
because Snakes are killing the young voles during "early summer" period.
thanks.
_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Senior Manager
Joined: 08 Nov 2008
Posts: 302
Followers: 3

Kudos [?]: 199 [0], given: 7

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 10:55
nitya ....you mean E . Isnt ??
My choice is E .
_________________

"CEO in making"

Senior Manager
Joined: 06 Jul 2007
Posts: 285
Followers: 3

Kudos [?]: 51 [0], given: 0

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 10:57
nitya34 wrote:
Friend, One Request
pls mention GPREP Q in subject line(If you are knowingly posting GPrep Q)

Btw,good Q indeed
we have to justify/support the explanation here
How the seasonal variation in mortality among young voles??

Its D
because Snakes are killing the young voles during "early summer" period.
thanks.

you mean E, don't you? If yes, I agree with your reasoning.
Intern
Joined: 22 Jan 2009
Posts: 6
Schools: rowan university
Followers: 0

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

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 15:34
The prairle vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.

Which of the followings, if true, provides the strongest support for the explanation offered?

1. It is in the spring and early summer that prairle vole communities generally contain the highest proportion of young voles.
2. Prairle vole populations vary dramatically in size from year to year
3. The prairle vole subsists primarily on bread-leaved plants that are abundant only in spring
4. Winters in the prairle voles’ habitat are often harsh, with temperatures that drop well below freezing.
5. Snakes, a major predator of young prairle vole, are active only from spring through early summer

E is the best choice, because we are concerned here about the mortality among young voles, which is the main cause of the seasonal variation of Mortality among voles.
Senior Manager
Joined: 26 May 2008
Posts: 431
Schools: Kellogg Class of 2012
Followers: 5

Kudos [?]: 72 [0], given: 4

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 19:10
Another E

Cheers,
Unplugged
Director
Joined: 04 Jan 2008
Posts: 912
Followers: 69

Kudos [?]: 572 [0], given: 17

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 20:57
yes yes E
Its a GMATPrep Q
_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Intern
Joined: 16 Dec 2008
Posts: 10
Schools: IIMA
Followers: 0

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

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

01 Mar 2009, 21:37
i think ans should be D, because the groups are large from aut to winter and spring to Autumn, the only period remain for smaller group is winter to spring. reason given in D clearly explains this, while the period in option E is when the group are large.
Manager
Joined: 11 Aug 2008
Posts: 161
Followers: 1

Kudos [?]: 49 [0], given: 8

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

26 Oct 2009, 17:57
The prairle vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.

Which of the followings, if true, provides the strongest support for the explanation offered?

1. It is in the spring and early summer that prairle vole communities generally contain the highest proportion of young voles.
2. Prairle vole populations vary dramatically in size from year to year
3. The prairle vole subsists primarily on bread-leaved plants that are abundant only in spring
4. Winters in the prairle voles’ habitat are often harsh, with temperatures that drop well below freezing.
5. Snakes, a major predator of young prairle vole, are active only from spring through early summer

It's a gmat prep indeed and OA is E. Mortality among young voles from spring through early summer because Snakes - a major predator of young prairle vole, are active only during this time
Director
Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
Posts: 651
Followers: 42

Kudos [?]: 863 [0], given: 39

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

23 Dec 2011, 03:13
Director
Joined: 28 Jul 2011
Posts: 563
Location: United States
GPA: 3.86
WE: Accounting (Commercial Banking)
Followers: 3

Kudos [?]: 211 [0], given: 16

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

23 Dec 2011, 04:05
with E,

Can anyone explain how C was thrown out?
_________________

Manager
Joined: 07 Aug 2011
Posts: 186
Location: United States
GMAT 1: 690 Q48 V37
Followers: 3

Kudos [?]: 23 [0], given: 6

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

26 Dec 2011, 06:38
kotela wrote:
with E,

Can anyone explain how C was thrown out?

We need to support mortality as one of the reason for seasonal variation in group size

C is not showing coz of mortality

E is showing so E it is
Manager
Joined: 07 Feb 2011
Posts: 92
Followers: 0

Kudos [?]: 59 [0], given: 44

Re: The prairie vole, a small North American grassland rodent, [#permalink]

### Show Tags

05 Mar 2013, 06:59
Why is D not correct in this? Is it because D does not mention an explicit link between harshness and infant mortality?
_________________

Re: The prairie vole, a small North American grassland rodent,   [#permalink] 05 Mar 2013, 06:59

Go to page    1   2    Next  [ 38 posts ]

Similar topics Replies Last post
Similar
Topics:
1 The prairie vole, a smal 0 05 Jun 2015, 04:05
*700* The number of North American children 0 12 Apr 2015, 07:15
9 Archaeologist: A skeleton of a North American mastodon that 3 22 Feb 2015, 11:29
The prairie vole, a small North American grassland 3 27 Nov 2014, 20:27
21 The prairie vole, a small North American grassland rodent, 15 18 Mar 2007, 18:23
Display posts from previous: Sort by