GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 17 Jan 2019, 13:23

Close

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
Your Progress

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.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • The winning strategy for a high GRE score

     January 17, 2019

     January 17, 2019

     08:00 AM PST

     09:00 AM PST

    Learn the winning strategy for a high GRE score — what do people who reach a high score do differently? We're going to share insights, tips and strategies from data we've collected from over 50,000 students who used examPAL.
  • Free GMAT Strategy Webinar

     January 19, 2019

     January 19, 2019

     07:00 AM PST

     09:00 AM PST

    Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.

The Laysan Rail, an insectivore bird once present on several of the Ha

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52231
The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 05 Jan 2019, 06:46
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

49% (01:49) correct 51% (01:41) wrong based on 164 sessions

HideShow timer Statistics

The Laysan Rail, an insectivore bird once present on several of the Hawaiian Islands, can no longer be found and is thought to be extinct. Scientists originally thought that a decrease in the amount of ground vegetation available for nesting was responsible for the decline of the bird. However, they now believe that increased competition for food was ultimately responsible for the Laysan Rail's inability to survive.

Which of the following would best help to account for the change in the accepted explanation for the Laysan Rail's extinction?


A. The vegetation on the Laysan Rail's home island was decimated when rabbits were introduced to the island in the 1910s.

B. When attempts were made to relocate the Laysan Rail to other islands, the birds lost the geographical cues that they relied on for finding mating sites.

C. The Laysan Rail builds nests under dense ground cover to protect the eggs.

D. An increase in the use of pesticides resulted in a decrease in the numbers of flies and moths present in the Laysan Rails territory.

E. Many species nested.in the same types of vegetation as the Laysan Rail.

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Manager
Manager
avatar
B
Joined: 29 Nov 2018
Posts: 52
Location: India
Concentration: Entrepreneurship, General Management
GPA: 3.99
WE: Engineering (Computer Hardware)
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 08 Jan 2019, 17:22
The question asks indirectly to find a reason for extinction except for lack of green vegetation.
If we take this into consideration only D option attacks the question.
Intern
Intern
avatar
S
Joined: 26 Apr 2017
Posts: 37
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 08 Jan 2019, 19:15
Answer E supports that there is increase in competition.

Answer D needs assumption that the bird's food is flies and moths. Decrease in these food sources necessitate the bird to migrate, starve to death, or even seek other types of food.
The other assumption is that when seeking other food sources, the bird is not able to compete with others.

So, I choose E that requires fewer assumptions - assumption that some species share the same food sources.

Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
Manager
Manager
avatar
B
Joined: 29 Nov 2018
Posts: 52
Location: India
Concentration: Entrepreneurship, General Management
GPA: 3.99
WE: Engineering (Computer Hardware)
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 08 Jan 2019, 19:37
Valhalla wrote:
Answer E supports that there is increase in competition.

Answer D needs assumption that the bird's food is flies and moths. Decrease in these food sources necessitate the bird to migrate, starve to death, or even seek other types of food.
The other assumption is that when seeking other food sources, the bird is not able to compete with others.

So, I choose E that requires fewer assumptions - assumption that some species share the same food sources.

Sent from my Moto G (5) Plus using GMAT Club Forum mobile app


Valhalla Option E does not mention green vegetation as food source. It talks about vegetation being nesting ground. So E does not even touch the topic of competition for food source.

But we need the answer choice to throw some light regarding competition for food source as the question asks us to look for a statement which helps to account for the change in the accepted explanation for the Laysan Rail's extinction.
Intern
Intern
avatar
B
Joined: 03 Jul 2017
Posts: 20
Location: India
Concentration: Finance, Accounting
WE: Information Technology (Computer Software)
CAT Tests
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 08 Jan 2019, 20:52
I think E is d best answer.

Anyone please confirm the official answer...

Sent from my ONEPLUS A6010 using GMAT Club Forum mobile app
Manager
Manager
avatar
S
Joined: 11 Feb 2018
Posts: 201
GMAT 1: 690 Q47 V37
GMAT 2: 710 Q50 V36
GMAT 3: 750 Q50 V42
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 08 Jan 2019, 23:11
Urgent expert help needed here pls...i marked D) because it was the only option in the scope though it dint make any sense at all to mark it

Argument clearly says “competition for food lead to decline” .D says competition for food exists.How can it be correct..?

Posted from my mobile device
Manager
Manager
avatar
B
Joined: 29 Nov 2018
Posts: 52
Location: India
Concentration: Entrepreneurship, General Management
GPA: 3.99
WE: Engineering (Computer Hardware)
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 09 Jan 2019, 20:09
redskull1 wrote:
Urgent expert help needed here pls...i marked D) because it was the only option in the scope though it dint make any sense at all to mark it

Argument clearly says “competition for food lead to decline” .D says competition for food exists.How can it be correct..?

Posted from my mobile device


The question states that competition for food was responsible for extinction. And option D gives us one possible way of how competition existed for food.
Manager
Manager
avatar
S
Joined: 24 Dec 2017
Posts: 179
Location: India
Concentration: Strategy, Real Estate
Schools: Johnson '21
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 10 Jan 2019, 00:18
Can someone please explain this question in detail?
Manager
Manager
avatar
S
Joined: 11 Feb 2018
Posts: 201
GMAT 1: 690 Q47 V37
GMAT 2: 710 Q50 V36
GMAT 3: 750 Q50 V42
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 10 Jan 2019, 00:32
Just to add....how that competition was brought about is also irrelevant to the argument in D).Would really love some expert analysis...

Posted from my mobile device
Intern
Intern
avatar
B
Joined: 02 Dec 2018
Posts: 13
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 11 Jan 2019, 09:39
Bunuel wrote:
The Laysan Rail, an insectivore bird once present on several of the Hawaiian Islands, can no longer be found and is thought to be extinct. Scientists originally thought that a decrease in the amount of ground vegetation available for nesting was responsible for the decline of the bird. However, they now believe that increased competition for food was ultimately responsible for the Laysan Rail's inability to survive.

Which of the following would best help to account for the change in the accepted explanation for the Laysan Rail's extinction?


A. The vegetation on the Laysan Rail's home island was decimated when rabbits were introduced to the island in the 1910s.

B. When attempts were made to relocate the Laysan Rail to other islands, the birds lost the geographical cues that they relied on for finding mating sites.

C. The Laysan Rail builds nests under dense ground cover to protect the eggs.

D. An increase in the use of pesticides resulted in a decrease in the numbers of flies and moths present in the Laysan Rails territory.

E. Many species nested.in the same types of vegetation as the Laysan Rail.


How can we assume here that Laysan Rails eat flies and moths?
Manager
Manager
User avatar
S
Joined: 28 Aug 2018
Posts: 193
CAT Tests
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 11 Jan 2019, 09:44
goobo wrote:
Bunuel wrote:
The Laysan Rail, an insectivore bird once present on several of the Hawaiian Islands, can no longer be found and is thought to be extinct. Scientists originally thought that a decrease in the amount of ground vegetation available for nesting was responsible for the decline of the bird. However, they now believe that increased competition for food was ultimately responsible for the Laysan Rail's inability to survive.

Which of the following would best help to account for the change in the accepted explanation for the Laysan Rail's extinction?


A. The vegetation on the Laysan Rail's home island was decimated when rabbits were introduced to the island in the 1910s.

B. When attempts were made to relocate the Laysan Rail to other islands, the birds lost the geographical cues that they relied on for finding mating sites.

C. The Laysan Rail builds nests under dense ground cover to protect the eggs.

D. An increase in the use of pesticides resulted in a decrease in the numbers of flies and moths present in the Laysan Rails territory.

E. Many species nested.in the same types of vegetation as the Laysan Rail.


How can we assume here that Laysan Rails eat flies and moths?



In the passage in start it is mentioned that the bird is an insectivore......that means it eats insect

Posted from my mobile device
_________________

"Press +1 KUDOS"

Be very critical of my Post
Ask as many questions of my post possible

Manager
Manager
User avatar
S
Joined: 28 Aug 2018
Posts: 193
CAT Tests
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 11 Jan 2019, 09:57
IMO D

Conclusion: they now believe that increased competition for food was ultimately responsible for the Laysan Rail's inability to survive.

Which of the following would best help to account for the change in the accepted explanation for the Laysan Rail's extinction?

Prethink: Food was the only reason for extinction of Laysan Rail's ...there was some scarcity of food or some competition for food which led to loss of food and hence decline in Laysan Rail


A. The vegetation on the Laysan Rail's home island was decimated when rabbits were introduced to the island in the 1910s.---Wrong, It does not mention any detail pertinent to food source of laysan being affected by rabbit

B. When attempts were made to relocate the Laysan Rail to other islands, the birds lost the geographical cues that they relied on for finding mating sites.----irrelevant

C. The Laysan Rail builds nests under dense ground cover to protect the eggs.----Wrong, does not address the conclusion

D. An increase in the use of pesticides resulted in a decrease in the numbers of flies and moths present in the Laysan Rails territory.--Correct, matches with prethinking

E. Many species nested.in the same types of vegetation as the Laysan Rail.---Wrong, because even if other species nested on same type of vegetation, it does not provides the result of that nesting....There could have been no effect or some effect or Most effect
_________________

"Press +1 KUDOS"

Be very critical of my Post
Ask as many questions of my post possible

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52231
Re: The Laysan Rail, an insectivore bird once present on several of the Ha  [#permalink]

Show Tags

New post 15 Jan 2019, 04:15
Bunuel wrote:
The Laysan Rail, an insectivore bird once present on several of the Hawaiian Islands, can no longer be found and is thought to be extinct. Scientists originally thought that a decrease in the amount of ground vegetation available for nesting was responsible for the decline of the bird. However, they now believe that increased competition for food was ultimately responsible for the Laysan Rail's inability to survive.

Which of the following would best help to account for the change in the accepted explanation for the Laysan Rail's extinction?


A. The vegetation on the Laysan Rail's home island was decimated when rabbits were introduced to the island in the 1910s.

B. When attempts were made to relocate the Laysan Rail to other islands, the birds lost the geographical cues that they relied on for finding mating sites.

C. The Laysan Rail builds nests under dense ground cover to protect the eggs.

D. An increase in the use of pesticides resulted in a decrease in the numbers of flies and moths present in the Laysan Rails territory.

E. Many species nested.in the same types of vegetation as the Laysan Rail.



KAPLAN OFFICIAL EXPLANATION:



D

Scientists first attributed the bird's extinction to a loss of ground vegetation, which the birds used for nesting, but they now believe that a lack of food (insects) was actually responsible. Let's examine the choices to find one that explains why scientists changed their opinion.

(A) provides evidence that a decrease in vegetation did in fact occur. If anything, that would have strengthened the hypothesis that loss of vegetation led to the birds' extinction, rather than causing the scientists to find a new explanation. (B) is out of scope. The passage doesn't concern relocation to other islands, and neither extinction hypothesis has anything to do with mating habits. (C) would strengthen the vegetation hypothesis, by providing evidence of how important the vegetation was to the birds' survival. (E) focuses on other species. Moreover, it supports the vegetation theory, not the food theory. (D) might explain the shift. Since the birds eat insects (Sentence 1), a decrease in the insect population would increase competition for food and could lead to extinction if the birds were not able to compete effectively.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

GMAT Club Bot
Re: The Laysan Rail, an insectivore bird once present on several of the Ha &nbs [#permalink] 15 Jan 2019, 04:15
Display posts from previous: Sort by

The Laysan Rail, an insectivore bird once present on several of the Ha

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.