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A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
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Anshuman0902 wrote:
explain q no 2 please
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
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Re: A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
2
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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.
Answer B.

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
(B) scepticism about celestial navigation as an explanation
(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.

Answer A.
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Re: A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
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Re: A mysterious phenomenon is the ability of over-water migrants to trave [#permalink]
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