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# The energy an animal must expend to move uphill is

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Manager
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The energy an animal must expend to move uphill is  [#permalink]

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Updated on: 21 Sep 2017, 07:08
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Difficulty:

55% (hard)

Question Stats:

62% (02:06) correct 38% (02:21) wrong based on 2332 sessions

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The energy an animal must expend to move uphill is proportional to its body weight, whereas the animal’s energy output available to perform this task is proportional to its surface area. This is the reason that small animals, like squirrel, can run up a tree trunk almost as fast as they can move on level ground, whereas large animals tend to slow down when they are moving uphill.

Which one of the following is an assumption on which the explanation above depends?

(A) The amount of energy needed to move uphill is no greater for large animals that it is for small animals.
(B) Small animals can move more rapidly than large animals can.
(C) The ratio of surface area to body weight is smaller in large animals than it is in small animals.
(D) There is little variation in the ratio of energy output to body weight among animals.
(E) The amount of energy needed to run at a given speed is proportional to the surface area of the running animal.

Source: LSAT

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Originally posted by jainu on 07 Jun 2009, 22:45.
Last edited by broall on 21 Sep 2017, 07:08, edited 1 time in total.
Reformatted question
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Re: The energy an animal must expend to move uphill is  [#permalink]

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27 Apr 2010, 10:23
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I answered the question using ratio:
let ratio for large animals = S/E
Ratio for small animals = s/e
option C: S/E < s/e.........when inverted looks like this:
E/S > e/s........ that is:
energy expended per unit space (for large animals) > that for small animals...
tallies with the stimulus and is thus the CORRECT answer.
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Re: The energy an animal must expend to move uphill is  [#permalink]

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07 Jun 2009, 23:11
tough question..i think its btwn B and C, leaning towards B
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08 Jun 2009, 01:20
IMO C

The energy an animal must expend to move uphill is proportional to its body weight, whereas the animal’s energy output available to perform this task is proportional to its surface area. This is the reason that small animals, like squirrel, can run up a tree trunk almost as fast as they can move on level ground, whereas large animals tend to slow down when they are moving uphill.
Which one of the following is an assumption on which the explanation above depends?
(A) The amount of energy needed to move uphill is no greater for large animals that it is for small animals --> counterfact
(B) Small animals can move more rapidly than large animals can --> it's not about the speed of large animals to small animals, it's about speed of each in uphill in compared with each' speed in flat ground
(C) The ratio of surface area to body weight is smaller in large animals than it is in small animals -->the best. Because such ratio of large animals is not equal to that of small animals, large animals can;t remain its speed when moving uphill as can small animals when moving uphill
(D) There is little variation in the ratio of energy output to body weight among animals --> no influence
(E) The amount of energy needed to run at a given speed is proportional to the surface area of the running animal -->not qualified enough to be basis of the argument
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08 Jun 2009, 02:19
Why B ?

IMO c shud be answer.. as the per logic above..
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08 Jun 2009, 02:27
I also vote for C.

B is out, since in the argument its mentioned that :
jainu wrote:
This is the reason that small animals, like squirrel, can run up a tree trunk almost as fast as they can move on level ground, whereas large animals tend to slow down when they are moving uphill.

We don't have any comparison of how these animals perform on level ground. The comparison is only for uphill.
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08 Jun 2009, 08:43
Straightaway C..

Answer can be prephased before even seeing the choices.

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08 Jun 2009, 13:03
Neochronic wrote:
Why B ?

IMO c shud be answer.. as the per logic above..

Im just skeptical about C because it could be that the surface/body ratio could be bigger on smaller animals. You could assume either way
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13 Jun 2009, 22:05
The answer is ofcourse.....But I o see one more flaw in the argument...While talking about the energy required and available, the direction goes to the speed....Which lead me to E initially..Can someone pls explain why E will not be credible...
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27 Apr 2010, 06:30
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I will also go with C for same reason....
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Re: The energy an animal must expend to move uphill is  [#permalink]

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27 Apr 2010, 10:35
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27 Apr 2010, 11:27
Guessed C... but really tough one.. mine was a pure lucky guess
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Re: The energy an animal must expend to move uphill is  [#permalink]

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27 Apr 2010, 13:06
good question and good explanation by gmatbull
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Re: The energy an animal must expend to move uphill is  [#permalink]

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27 Apr 2010, 23:41
Hi,

Option 'E' does not speak anything regarding "body weight" which does not cover the entire criteria. Hence, it is incorrect and the best option is 'C' as suggested.

Thanks.
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28 Apr 2010, 03:29
1

1) The argument above says that the energy an animal must expend to move uphill is proportional to its body weight and the animal’s energy output available to perform this task is proportional to its surface area.
2) Small animals can run up fast and the large animals slow down when moving up.

The second statement can only be true if we assume that the energy output of large animals is less than what is required and the energy output of small animals is more than what is required. From 1) it implies that surface area to body weight ratio is smaller in large animals than it is in small animals..

Hence option C.
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29 Apr 2010, 04:24
Though a little timetaking due to cautiosness, C is the inly option which consideres thefact that Surface area plays no role in large animals
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Re: The energy an animal must expend to move uphill is  [#permalink]

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06 Sep 2010, 09:48
Good one but if you read closely it is easy to figure out
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29 Apr 2011, 05:09
"C" for sure!!
Explanations are provided next to the answer choices!!
jainu wrote:
The energy an animal must expend to move uphill is proportional to its body weight, whereas the animal’s energy output available to perform this task is proportional to its surface area. This is the reason that small animals, like squirrel, can run up a tree trunk almost as fast as they can move on level ground, whereas large animals tend to slow down when they are moving uphill.

Which one of the following is an assumption on which the explanation above depends?

(A) The amount of energy needed to move uphill is no greater for large animals that it is for small animals.It is contradicting the argument,which clearly states that the energy needed is directly proportional to the body weight!!
(B) Small animals can move more rapidly than large animals can.One can not assume that small animals are more agile than the large ones for the information given in the argument says only about uphill movement!e.a. leopard might be quicker than squirrel on flat surface but he might not be quicker than squirrel in uphill movement!!
(C) The ratio of surface area to body weight is smaller in large animals than it is in small animals.This is the best choice as the amount of energy available for use is directly proportional to the body's surface area & amount of energy expended is directly proportion to the body weight. thus S.A./B.W. must be more to move quickly (uphill)
(D) There is little variation in the ratio of energy output to body weight among animals.By this logic all the animals should move uphill at almost same speed.
(E) The amount of energy needed to run at a given speed is proportional to the surface area of the running animal.One of the premises mentioned in the argument.

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01 May 2011, 22:21
conclusion is regarding speed and evidance are about energy.
So missing link or assumption should be the one which relates the two.
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Re: The energy an animal must expend to move uphill is  [#permalink]

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10 May 2011, 09:46
"E" is one of the premises mentioned in the argument.

Se my post above!
vdbhamare wrote:
conclusion is regarding speed and evidance are about energy.
So missing link or assumption should be the one which relates the two.

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Re: The energy an animal must expend to move uphill is &nbs [#permalink] 10 May 2011, 09:46

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