Last visit was: 10 Sep 2024, 17:46 It is currently 10 Sep 2024, 17:46
Toolkit
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

# Most of the year, the hermit thrush, a North American songbird, eats

SORT BY:
Tags:
Show Tags
Hide Tags
Director
Joined: 20 Apr 2022
Posts: 616
Own Kudos [?]: 355 [0]
Given Kudos: 338
Location: India
GPA: 3.64
Target Test Prep Representative
Joined: 24 Nov 2014
Status:Chief Curriculum and Content Architect
Affiliations: Target Test Prep
Posts: 3479
Own Kudos [?]: 5263 [3]
Given Kudos: 1431
GMAT 1: 800 Q51 V51
Tutor
Joined: 11 May 2022
Posts: 1080
Own Kudos [?]: 759 [0]
Given Kudos: 81
VP
Joined: 15 Dec 2016
Posts: 1318
Own Kudos [?]: 232 [0]
Given Kudos: 188
Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
Hi - two quick questions

Even though not an available option - i was wondering if this was also weakener (i was expecting this)

Quote:
 (option F) In the autumn, all the insects disappear underground - Thus insects are not accessible in the autumn

#2

Quote:
 Would you agree that option C does raise a follow-up. How much is the net calories gained if the hermits have insects vs. net calories gained if the hermits have berries. We need to compare this

Given we don't know this information -- C can't be chosen
GMAT Club Verbal Expert
Joined: 13 Aug 2009
Status: GMAT/GRE/LSAT tutors
Posts: 7056
Own Kudos [?]: 65046 [2]
Given Kudos: 1835
Location: United States (CO)
GMAT 1: 780 Q51 V46
GMAT 2: 800 Q51 V51
GRE 1: Q170 V170

GRE 2: Q170 V170
Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
2
Kudos
jabhatta2 wrote:
Hi - two quick questions

Even though not an available option - i was wondering if this was also weakener (i was expecting this)

Quote:
 (option F) In the autumn, all the insects disappear underground - Thus insects are not accessible in the autumn

#2

Quote:
 Would you agree that option C does raise a follow-up. How much is the net calories gained if the hermits have insects vs. net calories gained if the hermits have berries. We need to compare this

Given we don't know this information -- C can't be chosen

Regarding the additional answer choice: adding in your own options generally isn't worth the time. It can actually hurt your accuracy in answering the question, because instead of just assessing the options on the page, you're (on some level) trying to find the answer that you've developed yourself. This can cause you to overlook options -- like (C) -- that are correct, but don't match your "expected" answer.

For your second question: we're trying to find the answer choice that "most seriously calls into question the explanation given for the thrush’s diet during migration." So, we don't need an option that utterly destroys the explanation -- we just need one that calls it into question more than the other options do.

(C) does exactly that: by even raising the issue of net calories, it casts some doubt on the nutrient-based explanation. Perhaps, on balance, birds actually get more calories from eating berries than from eating insects. You're right that we don't know this for sure without additional info -- but it does provide us a reason to question the author's explanation. None of the other answer choices do that, so (C) is the correct answer.

I hope that helps!
Intern
Joined: 29 Jun 2024
Posts: 14
Own Kudos [?]: 2 [1]
Given Kudos: 5
Location: France
GPA: 3.5
Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
1
Kudos
WillGetIt wrote:
Most of the year, the hermit thrush, a North American songbird, eats a diet consisting mainly of insects, but in autumn, as the thrushes migrate to their Central and South American wintering grounds, they feed almost exclusively on wild berries. Wild berries, however, are not as rich in calories as insects, yet thrushes need to consume plenty of calories in order to complete their migration. One possible explanation is that berries contain other nutrients that thrushes need for migration and that insects lack.

Which of the following, if true, most seriously calls into question the explanation given for the thrush’s diet during migration?

(A) Hermit thrushes, if undernourished, are unable to complete their autumn migration before the onset of winter.

(B) Insect species contain certain nutrients that are not found in wild berries.

(C) For songbirds, catching insects requires the expenditure of significantly more calories than eating wild berries does.

(D) Along the hermit thrushes’ migration routes, insects are abundant throughout the migration season.

(E) There are some species of wild berries that hermit thrushes generally do not eat, even though these berry species are exceptionally rich in calories.

Fact: Most of the year, the hermit thrush, eats a diet consisting mainly of insects. Except in autumn when they feed almost exclusively on wild berries.
Problem: wild berries contains less calories than insects and birds need a lot of calories to complete their migration.
Potential explanation: berries contain other nutrients that thrushes need for migration and that insects lack

What am I asked ? => Find the answer that weaken most the explanation.

(C) For songbirds, catching insects requires the expenditure of significantly more calories than eating wild berries does.

If birds expend more calories catching the insects than eating wild berries, then they have no reason to eat insects even if they contain more calories.
=> New explanation for the thrush’s diet during migration => Weaken the other one
Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
1   2
Moderators:
GMAT Club Verbal Expert
7056 posts
GMAT Club Verbal Expert
234 posts
CR Forum Moderator
824 posts