• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

• Most awarded test prep in the world
Now free for 30 days

Available with Beat the GMAT members only code

• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

• Free Practice Test & Review
How would you score if you took the GMAT

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Award-winning private GMAT tutoring
Register now and save up to \$200

Available with Beat the GMAT members only code

## Birds need so much food energy to maintain their...

This topic has 2 expert replies and 1 member reply

### Top Member

Vincen Legendary Member
Joined
07 Sep 2017
Posted:
560 messages
6

#### Birds need so much food energy to maintain their...

Tue Sep 12, 2017 10:24 am
Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar-eating bird, since a given amount of nectar provides more energy than does the same amount of seeds
The argument relies on which one of the following questionable assumptions
(A) Birds of different species do not generally have the same overall energy requirements as each other
(B) The nectar-eating bird does not sometimes also eat seeds
(C) The time it takes for the nectar-eating bird to eat a given amount of nectar is not longer than the time it takes the seed-eating bird to eat the same amount of seeds
(D) The seed-eating bird does not have a lower body temperature than that of the nectar-eating bird
(E) The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives

OA is C.

How can I do this CR question? Can someone help me.

### GMAT/MBA Expert

GMATGuruNY GMAT Instructor
Joined
25 May 2010
Posted:
13920 messages
Followed by:
1809 members
13060
GMAT Score:
790
Wed Sep 13, 2017 6:39 am
Mo2men wrote:
GMATGuruNY wrote:
Vincen wrote:
Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar-eating bird, since a given amount of nectar provides more energy than does the same amount of seeds

The argument relies on which one of the following questionable assumptions

(A) Birds of different species do not generally have the same overall energy requirements as each other
(B) The nectar-eating bird does not sometimes also eat seeds
(C) The time it takes for the nectar-eating bird to eat a given amount of nectar is not longer than the time it takes the seed-eating bird to eat the same amount of seeds
(D) The seed-eating bird does not have a lower body temperature than that of the nectar-eating bird
(E) The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives.
Premise: A given amount of nectar provides more energy than does the same amount of seeds.
Conclusion: The seed-eating bird spends more time eating than does the nectar-eating bird.

Apply the NEGATION TEST.
When the correct answer choice is negated, the conclusion will be invalidated.

C, negated:
The time it takes for the nectar-eating bird to eat a given amount of nectar is longer than the time it takes the seed-eating bird to eat the same amount of seeds.
Here, the nectar-eating bird takes LONGER TO EAT than the seed-eating bird, invalidating the conclusion that the seed-eating bird spends more time eating than does the nectar-eating bird.
Since the negation of C invalidates the conclusion, C is an assumption: a statement that MUST BE TRUE for the conclusion to hold.

Dear Mitch,

If I negate D:

The seed-eating bird has a lower body temperature than that of the nectar-eating bird

If the body lower the seed-eating bird will spend less time eating , invalidating the the conclusion.

If I negate E:
The overall energy requirements of a given bird depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives.
This means the factors that can affect the time of eating, invalidating the conclusion. In some Assumption questions, we assume no other factors in place to validate the conclusion.

Can you help with above ?
The passage compares a bird of a seed-eating species to a bird of a nectar-eating species that HAS THE SAME OVERALL ENERGY REQUIREMENTS.
Thus, it is a PREMISE that the birds being compared all require the same amount of energy.
The negations of D and E attempt to weaken this premise.
A premise is a FACT: it cannot be weakened.
Any answer choice whose negation seems to weaken a premise is WRONG.
Eliminate D and E.

_________________
Mitch Hunt
GMAT Private Tutor
GMATGuruNY@gmail.com
If you find one of my posts helpful, please take a moment to click on the "UPVOTE" icon.
Available for tutoring in NYC and long-distance.

Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now.

### Top Member

Mo2men Legendary Member
Joined
25 Sep 2015
Posted:
564 messages
Followed by:
5 members
14
Wed Sep 13, 2017 5:48 am
GMATGuruNY wrote:
Vincen wrote:
Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar-eating bird, since a given amount of nectar provides more energy than does the same amount of seeds

The argument relies on which one of the following questionable assumptions

(A) Birds of different species do not generally have the same overall energy requirements as each other
(B) The nectar-eating bird does not sometimes also eat seeds
(C) The time it takes for the nectar-eating bird to eat a given amount of nectar is not longer than the time it takes the seed-eating bird to eat the same amount of seeds
(D) The seed-eating bird does not have a lower body temperature than that of the nectar-eating bird
(E) The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives.
Premise: A given amount of nectar provides more energy than does the same amount of seeds.
Conclusion: The seed-eating bird spends more time eating than does the nectar-eating bird.

Apply the NEGATION TEST.
When the correct answer choice is negated, the conclusion will be invalidated.

C, negated:
The time it takes for the nectar-eating bird to eat a given amount of nectar is longer than the time it takes the seed-eating bird to eat the same amount of seeds.
Here, the nectar-eating bird takes LONGER TO EAT than the seed-eating bird, invalidating the conclusion that the seed-eating bird spends more time eating than does the nectar-eating bird.
Since the negation of C invalidates the conclusion, C is an assumption: a statement that MUST BE TRUE for the conclusion to hold.

Dear Mitch,

If I negate D:

The seed-eating bird has a lower body temperature than that of the nectar-eating bird

If the body lower the seed-eating bird will spend less time eating , invalidating the the conclusion.

If I negate E:
The overall energy requirements of a given bird depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives.
This means the factors that can affect the time of eating, invalidating the conclusion. In some Assumption questions, we assume no other factors in place to validate the conclusion.

Can you help with above ?

### GMAT/MBA Expert

GMATGuruNY GMAT Instructor
Joined
25 May 2010
Posted:
13920 messages
Followed by:
1809 members
13060
GMAT Score:
790
Wed Sep 13, 2017 3:00 am
Vincen wrote:
Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar-eating bird, since a given amount of nectar provides more energy than does the same amount of seeds

The argument relies on which one of the following questionable assumptions

(A) Birds of different species do not generally have the same overall energy requirements as each other
(B) The nectar-eating bird does not sometimes also eat seeds
(C) The time it takes for the nectar-eating bird to eat a given amount of nectar is not longer than the time it takes the seed-eating bird to eat the same amount of seeds
(D) The seed-eating bird does not have a lower body temperature than that of the nectar-eating bird
(E) The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives.
Premise: A given amount of nectar provides more energy than does the same amount of seeds.
Conclusion: The seed-eating bird spends more time eating than does the nectar-eating bird.

Apply the NEGATION TEST.
When the correct answer choice is negated, the conclusion will be invalidated.

C, negated:
The time it takes for the nectar-eating bird to eat a given amount of nectar is longer than the time it takes the seed-eating bird to eat the same amount of seeds.
Here, the nectar-eating bird takes LONGER TO EAT than the seed-eating bird, invalidating the conclusion that the seed-eating bird spends more time eating than does the nectar-eating bird.
Since the negation of C invalidates the conclusion, C is an assumption: a statement that MUST BE TRUE for the conclusion to hold.

_________________
Mitch Hunt
GMAT Private Tutor
GMATGuruNY@gmail.com
If you find one of my posts helpful, please take a moment to click on the "UPVOTE" icon.
Available for tutoring in NYC and long-distance.

Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now.

### Best Conversation Starters

1 lheiannie07 108 topics
2 ardz24 68 topics
3 Roland2rule 65 topics
4 LUANDATO 53 topics
5 VJesus12 52 topics
See More Top Beat The GMAT Members...

### Most Active Experts

1 GMATGuruNY

The Princeton Review Teacher

146 posts
2 Jeff@TargetTestPrep

Target Test Prep

119 posts
3 Rich.C@EMPOWERgma...

EMPOWERgmat

114 posts
4 Scott@TargetTestPrep

Target Test Prep

101 posts
5 EconomistGMATTutor

The Economist GMAT Tutor

85 posts
See More Top Beat The GMAT Experts