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# 6-161. Adult female rats who have never before encountered

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Manager
Joined: 02 Apr 2006
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6-161. Adult female rats who have never before encountered [#permalink]

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26 May 2006, 22:02
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6-161. Adult female rats who have never before encountered rat pups will start to show maternal behaviors after being confined with a pup for about seven days. This period can be considerably shortened by disabling the femaleâ€™s sense of smell or by removing the scent-producing glands of the pup.

Which of the following hypotheses best explains the contrast described above?

(A) The sense of smell in adult female rats is more acute than that in rat pups.
(B) The amount of scent produced by rat pups increases when they are in the presence of a female rat that did not bear them.
(C) Female rats that have given birth are more affected by olfactory cues than are female rats that have never given birth.
(D) A female rat that has given birth shows maternal behavior toward rat pups that she did not bear more quickly than does a female rat that has never given birth.
(E) The development of a female rat's maternal interest in a rat pup that she did not bear is inhibited by the odor of the pup.

pls help me understand how to approach this question..

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Senior Manager
Joined: 09 Mar 2006
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27 May 2006, 00:18
E it is.

The only one that describe the fact stated in the last sentence of the passage.

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Manager
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27 May 2006, 04:06
I think B..

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Director
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27 May 2006, 06:01
E it is.

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Director
Joined: 26 Sep 2005
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29 May 2006, 00:58
oh yEah

--> well, argument states that the time priod of seven days can be shortened for the adult female rat to develop an interest in the rat that she did not bear by removing the olfactory sensors.

E gives us a clear response that since these sensors inhibit the development of maternal interest, removing them will in fact aid in developing a faster maternal interest and hence the time period can be shortened.

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GMAT Club Legend
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29 May 2006, 01:46
Should be E. It tells us that the interst is inhibited by the odor of the pup. So if the glands secreting this scent is removed, interest in the pup would be raised.

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VP
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29 May 2006, 01:58
Without a doubt E.

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SVP
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29 May 2006, 05:10
E the clear winner.

To approach the question, understand the question.
The question asks about a hypothesis that will support the contrast in the statement.
Now the contrast is "under normal circumstances a female rat gets accustomed to a pup in x days, but the time can be shortened by removing the sense of smell from female rats or odor producing orgrans"

Hence we can assume or hypthesize that smell somehow inhibits the female rats to get accustomed to the pup.

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29 May 2006, 05:10
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# 6-161. Adult female rats who have never before encountered

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