Each species of moth has an optimal body temperature for : GMAT Critical Reasoning (CR)
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# Each species of moth has an optimal body temperature for

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Each species of moth has an optimal body temperature for [#permalink]

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06 May 2009, 13:16
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Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

A. large moths are generally able to maneuver better in flight than smaller moths
B. large moths are proportionally much more common in warm climates than in cool climates
C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
E. most predators of moths prey not only on several different species of moth but also on various species of other insects

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06 May 2009, 14:49
B

large moths dont get eaten as much in warm weather.
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06 May 2009, 15:08
I would go with B.

here is my explanation ,Though I am not good in explaining so pardon me in case i am not able to provide explanation clearly

Argument starts with describing relationship between optimal body temp and flying and role of air temp. Then the focus shifts to Large moths and the but also ... indicates that the author is giving a different perspective and B fits.

A. large moths are generally able to maneuver better in flight than smaller moths -large moths can fly faster however this does not go with the but also statement

B. large moths are proportionally much more common in warm climates than in cool climates

C. small moths are more likely than large moths to be effectively camouflaged while on vegetation - this doesn't make sense to me as there is no discussion on camouflaged
D. large moths typically have wings that are larger in proportion to their body size than smaller moths do - so what ?
E. most predators of moths prey not only on several different species of moth but also on various species of other insects - this is not at all related
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06 May 2009, 19:16
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Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

A. large moths are generally able to maneuver better in flight than smaller moths --> no info
B. large moths are proportionally much more common in warm climates than in cool climates --> best. Because of less vulnerable in warm climates than in cool climates, they are less likely to be eaten and thus proportionally more common in warm climates than in cool cliamtes
C. small moths are more likely than large moths to be effectively camouflaged while on vegetation --> no info about camouflage
D. large moths typically have wings that are larger in proportion to their body size than smaller moths do --> no info about size
E. most predators of moths prey not only on several different species of moth but also on various species of other insects --> irrelevant
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06 May 2009, 22:14
neeshpal wrote:
Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

A. large moths are generally able to maneuver better in flight than smaller moths
B. large moths are proportionally much more common in warm climates than in cool climates
C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
E. most predators of moths prey not only on several different species of moth but also on various species of other insects

C is the best

The argument focuses on the pros and cons of the smaller and the larger moth. The last sentence points out the advantage of the larger moth, and it uses "but" to give the disadvantage of the larger too. Gmat does not say directly the disadvantage, instead says the pros of the smaller one.

B should not be OA, b/c "but" is used to negate all the thing said before
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07 May 2009, 04:49
Agree with B.
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28 Oct 2009, 23:16
I go for B
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29 Oct 2009, 14:16
IMO B.

The other answers make assumptions that are out of the scope of the question.
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17 Dec 2009, 05:57
Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

A. large moths are generally able to maneuver better in flight than smaller moths-------INCORRECT stimulus doesnt mention any relation between maneuvering and moths
B. large moths are proportionally much more common in warm climates than in cool climatesCORRECT. If larger moths have high optimal body temperatures they would be found more in warmer climates than in cooler climates as in cooler climates the differential temperature between their high optimal body temperature will be larger and hence they would have to remain inactive
C. small moths are more likely than large moths to be effectively camouflaged while on vegetation INCORRECT. This is a trap. Both would need camouflaging/or any other mechanism to escape predators while on vegetation irrespective of their flying abilities
D. large moths typically have wings that are larger in proportion to their body size than smaller moths doINCORRECT. The relationship with larger wings and body temperature seems out of scope as it doesnt make any sense here
E. most predators of moths prey not only on several different species of moth but also on various species of other insectINCORRECT. Out of scope

Hope this resolves the confusion between B and C
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31 Dec 2009, 01:36
Agree with B.

Bigger moths have higher optimal temperature which is consistent with details in B.
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31 Dec 2009, 04:27
I thought the answer to be C. However, I see that most of the guys here have reasoned for B, though I am not 100% convinced.

Plz share the OA along with OE, if possible.
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02 Jan 2010, 12:21
neeshpal wrote:
Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

A. large moths are generally able to maneuver better in flight than smaller moths
B. large moths are proportionally much more common in warm climates than in cool climates
C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
E. most predators of moths prey not only on several different species of moth but also on various species of other insects

i would go with B after POE..
A.Too extreme a sentence for the information provided int he text about the flight of the moths.
C.Camouflage not discussed.
D.Wing Size not discussed.
E.Other insects do not discussed.
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29 Aug 2011, 18:27
Would go with B also.
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29 Aug 2011, 22:54
+1 B

Large moths need warmer climates to fly efectively. That help them to avoid predators also.
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29 Aug 2011, 23:59
kaliaabhishek wrote:
I think C..mainly coz 'but' is used...
plz provide the OA

"camouflaging" is not at all mentioned in the passage. I don't know where is this question from. But, "B" seems more plausible. Smaller moth-lower body temperature-relatively less warm climate is ideal.
Larger moth-higher body temperature-relatively higher warm climate is ideal, or they won't function as effectively.

You are right in noticing "but". "but" should show a contrast that rules out "A" as an answer. Also, "B" shows a reason why the higher body temperature is suited better for warmer climate, and we definitely need a reason "which explains why".

Ans: "B"
******************************

If anyone knows the source and OA for this question, please PM or reply to the post. thanks
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30 Aug 2011, 03:28
B is straigth........
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01 Jun 2014, 21:17
A is the right answe.
http://www.beatthegmat.com/species-of-moth-t52573.html
carcass wrote:
B is straigth........
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Re: Each species of moth has an optimal body temperature for [#permalink]

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07 Aug 2014, 19:31
As an FYI, this is a GMATPREP question.
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Each species of moth has an optimal body temperature for [#permalink]

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20 Jun 2015, 09:03
Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

premise 1 : optimal body temperature for effective flight
premise 2 : larger moth more optimal temperature for flight.
The below option which explain the above premise:

A. large moths are generally able to maneuver better in flight than smaller moths
We are not concerned about maneuvering aspect of the flight. we are just bothered about the relation between flight of larger moth and optimal temperature

B. large moths are proportionally much more common in warm climates than in cool climates
This option talks about why more larger moth are present in warm climates compared to cool climates as larger moth has higher optimal temperatures -> Correct

C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
We are not concerned about the "camouflage" aspect of the moth.

D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
We are not concerned about the larger wings of large moths.

E. most predators of moths prey not only on several different species of moth but also on various species of other insects
We are not concerned about the prey aspect of the moths
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Each species of moth has an optimal body temperature for [#permalink]

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11 Aug 2015, 22:49
kinjiGC wrote:
Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

B. large moths are proportionally much more common in warm climates than in cool climates
This option talks about why more larger moth are present in warm climates compared to cool climates as larger moth has higher optimal temperatures -> Correct

kinjiGC thanks for the explanation

I feel there is no Logically connectivity when B is plugged and the sentence is read as a whole.

In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why large moths are proportionally much more common in warm climates than in cool climates.

Generally BUT is used to spot out contradictions : Ex: I walk very fast , but I cannot Run.
Each species of moth has an optimal body temperature for   [#permalink] 11 Aug 2015, 22:49
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