parul9 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 : )

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.

parul9 wrote:you have my permission to respond, if you sought that by this reply!

1947 wrote:whats OA I am also getting B
plese help

mundasingh123 wrote:

1947 wrote:whats OA I am also getting B
plese help

OA is B

Geva@MasterGMAT wrote:

mundasingh123 wrote:

1947 wrote:whats OA I am also getting B
plese help

OA is B

And rightly so. The argument explains the term "effective flight" only in terms of "cannot fly if temperature are below optimal temp., and so are highly vulnerable to predators". So if the larger moths have a higher optimal temperature, it means that can only fly when it's hot - which means that we'll find less of them in the cold, as any poor moth who find itself there falls asleep in the snow and gets eaten.

We are told nothing of the relation of maneuverability and size, so A is irrelevant.
We are told nothing of camouflage, so C is irrelevant too.

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 : )