Species of Moth

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Species of Moth

by mgmt_gmat » Fri Feb 12, 2010 2:23 am
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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by komal » Fri Feb 12, 2010 2:26 am
mgmt_gmat 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
Correct : It is stated in the premise that each species had optimal body tempt. for effective flight. Hence if the large moths have higher optimal body tempt. it only means that they are able to maneuver better in flights.

B. large moths are proportionally much more common in warm climates than in cool climates
Incorrect : Proportion of moths found in warm or cool climates is irrelevant to the scope of the argument.

C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
Incorrect : Camouflage is additional info. here. Eliminated.

D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
Incorrect : Size of wings is out of scope.

E. most predators of moths prey not only on several different species of moth but also on various species of other insects
Incorrect : The premises stated above in no way lead to this conclusion.
Hope this helps : )

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by ssgmatter » Sat May 22, 2010 9:46 pm
mgmt_gmat 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
Any taker for this one?......
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by paes » Mon May 24, 2010 3:16 am
IMO A
Komal has given the right explanations.

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by FightWithGMAT » Mon May 24, 2010 3:41 am
komal wrote:
mgmt_gmat 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
Correct : It is stated in the premise that each species had optimal body tempt. for effective flight. Hence if the large moths have higher optimal body tempt. it only means that they are able to maneuver better in flights.

B. large moths are proportionally much more common in warm climates than in cool climates
Incorrect : Proportion of moths found in warm or cool climates is irrelevant to the scope of the argument.

C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
Incorrect : Camouflage is additional info. here. Eliminated.

D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
Incorrect : Size of wings is out of scope.

E. most predators of moths prey not only on several different species of moth but also on various species of other insects
Incorrect : The premises stated above in no way lead to this conclusion.
Hope this helps : )

Why B is out of scope? In the argument, air temperature is mentioned. When this temp falls below the optimal body temp, moths have to be in rest. They do not fly. Higher optimal temp means that there are less chances of air temp going below the higher optimal temp of moths, and they can fly frequently and can evade predators easily. That is why they are more common in warmer places that are small moths.

I may be thinking too wide. Please explain this.

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by paes » Mon May 24, 2010 4:46 am
FightWithGMAT wrote:
komal wrote:
mgmt_gmat 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
Correct : It is stated in the premise that each species had optimal body tempt. for effective flight. Hence if the large moths have higher optimal body tempt. it only means that they are able to maneuver better in flights.

B. large moths are proportionally much more common in warm climates than in cool climates
Incorrect : Proportion of moths found in warm or cool climates is irrelevant to the scope of the argument.

C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
Incorrect : Camouflage is additional info. here. Eliminated.

D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
Incorrect : Size of wings is out of scope.

E. most predators of moths prey not only on several different species of moth but also on various species of other insects
Incorrect : The premises stated above in no way lead to this conclusion.
Hope this helps : )

Why B is out of scope? In the argument, air temperature is mentioned. When this temp falls below the optimal body temp, moths have to be in rest. They do not fly. Higher optimal temp means that there are less chances of air temp going below the higher optimal temp of moths, and they can fly frequently and can evade predators easily. That is why they are more common in warmer places that are small moths.

I may be thinking too wide. Please explain this.
For warm places, whether it is large moth or small moth, both can live/fly comfortably. So the argument does not justify this answer choice.

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by sushbis » Thu Oct 06, 2011 6:44 am
answer should be B. since warm climates is the place where large moths can be found if the information above is consistent

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by navami » Thu Oct 06, 2011 8:48 am
To be honest A seems to be out of context ... B is the best option.
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by mukgera » Fri Oct 07, 2011 7:31 pm
Agree with navami on this...
Having higher optimal temp doesn't seems to mean that they can better maneuver the fight but it means that larger moth can fight better at high temp.

IMO B..
OA please ?
navami wrote:To be honest A seems to be out of context ... B is the best option.

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by mundasingh123 » Fri Oct 07, 2011 9:37 pm
maneouver is not mentioned in the argument
I Seek Explanations Not Answers

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by theforrestgump » Fri Oct 07, 2011 11:08 pm
IMO A

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by theforrestgump » Fri Oct 07, 2011 11:11 pm
mundasingh123 wrote:maneouver is not mentioned in the argument
It is still not out of scope, because the author mentions that
Each species of moth has an optimal body temperature for effective flight.
Effective flight can be anything...greater speed, better maneuver, all fall in scope..

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by sl750 » Sat Oct 08, 2011 12:07 am
Where is the original poster of this argument?. I hope the argument didn't effect his optimal body temperature to respond

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by gmatclubmember » Sat Oct 08, 2011 6:41 am
Shouldn't the answer be C.

we have to mention some quality of big moth which is a disadvantage for it (there is a "but" in the question stem after mentioning an advantage of big moths). camouflage is not really out of scope.
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by parul9 » Sat Oct 08, 2011 6:50 am
komal wrote:
mgmt_gmat 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
Correct : It is stated in the premise that each species had optimal body tempt. for effective flight. Hence if the large moths have higher optimal body tempt. it only means that they are able to maneuver better in flights.

B. large moths are proportionally much more common in warm climates than in cool climates
Incorrect : Proportion of moths found in warm or cool climates is irrelevant to the scope of the argument.

C. small moths are more likely than large moths to be effectively camouflaged while on vegetation
Incorrect : Camouflage is additional info. here. Eliminated.

D. large moths typically have wings that are larger in proportion to their body size than smaller moths do
Incorrect : Size of wings is out of scope.

E. most predators of moths prey not only on several different species of moth but also on various species of other insects
Incorrect : The premises stated above in no way lead to this conclusion.
Hope this helps : )
Hi Komal,

If we see the last sentence of the CR: "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 ______. "
doesn't "higher optimal temp" and more importantly the start of this part with a "but" mean that that the remaining part of the sentence should talk about the effects of higher optimal temperature, instead of flight effectiveness due to optimal temperature?
For that reason, I marked the answer as B.