Last visit was: 24 Jul 2024, 23:10 It is currently 24 Jul 2024, 23:10
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.

# A mysterious phenomenon is the ability of over-water migrants to trave

SORT BY:
Tags:
Show Tags
Hide Tags
Director
Joined: 05 Feb 2018
Posts: 755
Own Kudos [?]: 2309 [4]
Given Kudos: 139
Location: India
Concentration: Finance
GPA: 2.77
WE:General Management (Other)
Manager
Joined: 19 Jan 2016
Posts: 67
Own Kudos [?]: 75 [2]
Given Kudos: 57
Location: India
Schools: ISB '20
GMAT 1: 650 Q44 V37
GPA: 3.5
Manager
Joined: 31 Jul 2020
Posts: 51
Own Kudos [?]: 7 [0]
Given Kudos: 68
GRE Forum Moderator
Joined: 02 Nov 2016
Posts: 14064
Own Kudos [?]: 36854 [0]
Given Kudos: 5834
GPA: 3.62
A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
Anshuman0902 wrote:
thanx

Read the lines in the passage:

"after a flock travelling east is blown far south by a storm, it will assume the proper north-easterly course to compensate."

It says that the birds will keep their direction hence A.

Thank you
Senior Manager
Joined: 07 Jan 2018
Posts: 266
Own Kudos [?]: 276 [2]
Given Kudos: 161
Location: India
GMAT 1: 710 Q49 V38
Re: A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
2
Kudos
Primary Purpose of the passage: To speculate on the mystery of navigational method by which some living beings navigate.

Q1. The main idea of the passage is that

(A) migration over land requires a simpler explanation than migration over water does - Incorrect. over land vs over water is not the concern
(B) the means by which animals migrate over water are complex and only partly understood - Correct.
(C) the ability of migrant animals to keep track of time is related to their magnetic sense - Incorrect. "Magnetic sense" is one of the possible theories; "IS": too strong.
(D) knowledge of geographic location is essential to migrants with little or no compass sense- Incorrect. Debatable theory.
(E) explanations of how animals migrate tend -to replace, rather than build on, one another - Incorrect. Can't be inferred.

Q2. It can be inferred from the passage that if the flock of birds described were navigating by compass sense alone, they would, after the storm, fly
(A) east
(B) north
(C) northwest
(D) south
(E) southeast

Answer is A. "But compass sense alone cannot explain how birds navigate the ocean: after a flock travelling east is blown far south by a storm, it will assume the proper north-easterly course to compensate."
This statement shows that if the birds navigated by using an internal compass alone, then they would have continued to move eastward.

Q3. In maintaining that migrating animals would need "a fantastic map sense" to determine their geographic position by celestial navigation, the author intends to express

(A) admiration for the ability of the migrants
(C) certainty that the phenomenon of migration will remain mysterious
(D) interest in a new method of accounting for over-water migration
(E) surprise that animals apparently navigate in much the same way that human beings do

Answer B. The intent of using the phrase "a fantastic map sense" is to imply that celestial navigation as an explanation is highly improbable.

Q4. Of the following descriptions of migrating animals, which most strongly suggests that the animals are depending on magnetic cues to orient themselves?

(A) Pigeons can properly readjust their course even when flying long distances through, exceedingly dense fogs. - Correct. If dense fog is prevalent, then the pigeons will not be able to take celestial cues and geographical cues. Then, the only possible explanation would be magnetic cues.
(B) Bison are able to reach their destination by passing through a landscape that has been partially altered by a recent fire. - Incorrect. Celestial cues will also be possible.
(C) Elephants are able to find grounds that some members of the herd have never seen before. - Incorrect. All type of cues are possible.
(D) Swallows are able to return to a given spot at the same time every year. - Incorrect. All type of cues are possible.
(E) Monarch butterflies coming from different parts of North America are able to arrive at the same location each winter.

Non-Human User
Joined: 01 Oct 2013
Posts: 17526
Own Kudos [?]: 870 [0]
Given Kudos: 0
Re: A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
Moderators:
GMAT Club Verbal Expert
6985 posts
GMAT Club Verbal Expert
236 posts
GRE Forum Moderator
14064 posts