At night, a flock of crows will generally perch close together in a sm

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At night, a flock of crows will generally perch close together in a small place—often a piece of wooded land—called a roost. Each morning, the crows leave the roost and fan out in small groups to hunt and scavenge the surrounding area. For most flocks, the crow’s hunting extends as far as 100 to 130 kilometers (60 to 80 miles) from the roost. Normally, a flock will continue to occupy the same roost for several consecutive years, and when it abandons a roost site for a new one the new roost is usually less than eight kilometers (five miles) away.

Of the following claims, which one can most justifiably be rejected on the basis of the statement above?

(A) Crows will abandon their roost site only in response to increase in the population of the flock.

(B) When there is a shortage of food in the area in which a flock of crows normally hunts and scavenges, some members of the flock will begin to hunt and scavenge outside that area.

(C) Most of the hunting and scavenging that crows do occurs more than eight kilometers (five miles) from their roost.

(D) Once a flock of crows has settled on a new roost site, it is extremely difficult to force it to abandon that site for another.

(E) When a flock of crows moves to a new roost site, it generally does so because the area in which it has hunted and scavenged has been depleted of food sources.

globaldesi · Answer

IMO C
C explicitly states that Most of the  hunting and scavenging that crows do occurs more than eight kilometers  (five miles) from their roost.
Stmt no where gives a number that it begins with more than 8 km.It just states that range that it can extend upto 100km

C can be rejected

shameekv1989 · Answer

At night, a flock of crows will generally perch close together in a small place—often a piece of wooded land—called a roost. Each morning, the crows leave the roost and fan out in small groups to hunt and scavenge the surrounding area. For most flocks, the crow’s hunting extends as far as 100 to 130 kilometers (60 to 80 miles) from the roost. Normally, a flock will continue to occupy the same roost for several consecutive years, and when it abandons a roost site for a new one the new roost is usually less than eight kilometers (five miles) away.

Of the following claims, which one can most justifiably be rejected on the basis of the statement above?

(A) Crows will abandon their roost site only in response to increase in the population of the flock.  - Neither supported nor rejected

(B) When there is a shortage of food in the area in which a flock of crows normally hunts and scavenges, some members of the flock will begin to hunt and scavenge outside that area.  - Correct -  generally perch close together in a small place ;  a flock will continue to occupy the same roost for several consecutive years  - suggesting that the flock lives together in whatever condition may present. Noone from the flock go beyond the mentioned area (beyond 130kms)

(C) Most of the hunting and scavenging that crows do occurs more than eight kilometers (five miles) from their roost.  - Neither supported nor rejected

(D) Once a flock of crows has settled on a new roost site, it is extremely difficult to force it to abandon that site for another.  - Neither supported nor rejected

(E) When a flock of crows moves to a new roost site, it generally does so because the area in which it has hunted and scavenged has been depleted of food sources.  - Neither supported nor rejected

Answer - B

TarPhi · Answer

Of the following claims, which one can most justifiably be rejected on the basis of the statement above?

(A) Crows will abandon their roost site only in response to an increase in the population of the flock.
Makes sense. A possible reason why they move.

(B) When there is a shortage of food in the area in which a flock of crows normally hunts and scavenges, some members of the flock will begin to hunt and scavenge outside that area.
It says 60-80 km - It's not a fixed boundary.

(C) Most of the hunting and scavenging that crows do occurs more than eight kilometres (five miles) from their roost.
Odd but possible!

(D) Once a flock of crows has settled on a new roost site, it is extremely difficult to force it to abandon that site for another.
It says that they move after several years.

(E) When a flock of crows moves to a new roost site, it generally does so because the area in which it has hunted and scavenged has been depleted of food sources.
They are moving within 8 KMs. The area of hunting is a 100KM radius. Doesn't make sense!?!?!?!

Correct Answer - E

chaitralirr · Answer

At night, a flock of crows will generally perch close together in a small place—often a piece of wooded land—called a roost. Each morning, the crows leave the roost and fan out in small groups to hunt and scavenge the surrounding area. For most flocks, the crow’s hunting extends as far as 100 to 130 kilometers (60 to 80 miles) from the roost. Normally, a flock will continue to occupy the same roost for several consecutive years, and when it abandons a roost site for a new one the new roost is usually less than eight kilometers (five miles) away.

Stimulus: At night the flock of crows generally perch close often on a piece of wood called the roost. Each morning the crow leaves the roost and hunts and comes back. The crows if abandon the old roost they ensure it is just 8 km away.

IMO E because it says they switch to new roost only when the area of old roost depletes the food and scavenge on which they feed on.

IMO E because it says they switch to new roost only when the area of old roost depletes the food and scavenge on which they feed on. 
 
Of the following claims, which one can most justifiably be rejected on the basis of the statement above?

(A) Crows will abandon their roost site only in response to increase in the population of the flock.

(B) When there is a shortage of food in the area in which a flock of crows normally hunts and scavenges, some members of the flock will begin to hunt and scavenge outside that area.

(C) Most of the hunting and scavenging that crows do occurs more than eight kilometers (five miles) from their roost.

(D) Once a flock of crows has settled on a new roost site, it is extremely difficult to force it to abandon that site for another.

(E) When a flock of crows moves to a new roost site, it generally does so because the area in which it has hunted and scavenged has been depleted of food sources.

GMAT0010 · Answer

Hi, I still don't seem to understand the difference between B and D. Kindly explain please

GMAT0010 · Answer

Hi, I still don't seem to understand the difference between B and D. Kindly explain please

righthand · Answer

It's 'Could be True' Vs 'Definitely Wrong' based on the given information.

(A) Crows will abandon their roost site only in response to increase in the population of the flock. - Could be True (Incorrect)

(B) When there is a shortage of food in the area in which a flock of crows normally hunts and scavenges, some members of the flock will begin to hunt and scavenge outside that area. - Could be True (Incorrect)

(C) Most of the hunting and scavenging that crows do occurs more than eight kilometers (five miles) from their roost.- Could be True (Incorrect)

(D) Once a flock of crows has settled on a new roost site, it is extremely difficult to force it to abandon that site for another.- Could be True (Incorrect)

(E) When a flock of crows moves to a new roost site, it generally does so because the area in which it has hunted and scavenged has been depleted of food sources. - Wait a sec! The new site is within 8 km range and they hunt as far as 130 km. Definitely Wrong. (CORRECT)

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peanuts · Answer

At night, a flock of crows will generally perch close together in a small place—often a piece of wooded land—called a roost. Each morning, the crows leave the roost and fan out in small groups to hunt and scavenge the surrounding area. For most flocks, the crow’s hunting extends as far as 100 to 130 kilometers (60 to 80 miles) from the roost. Normally, a flock will continue to occupy the same roost for several consecutive years, and when it abandons a roost site for a new one the new roost is usually less than eight kilometers (five miles) away.

Analysis: as in the stem, the new roost is only 8 kilometers away from the old one. This distance is still within the hunting range of the old roost. This is an important factor to remember

Of the following claims, which one can most justifiably be rejected on the basis of the statement above?

(A) Crows will abandon their roost site only in response to increase in the population of the flock.
 No info to completely reject this theory

(B) When there is a shortage of food in the area in which a flock of crows normally hunts and scavenges, some members of the flock will begin to hunt and scavenge outside that area.
 No thing to deny this assumption

(C) Most of the hunting and scavenging that crows do occurs more than eight kilometers (five miles) from their roost.
 It is possible. Because hunting range is less than 8km, the crows just need to move out of that to get new food source

(D) Once a flock of crows has settled on a new roost site, it is extremely difficult to force it to abandon that site for another.
 Possible. No info to deny this statement

(E) When a flock of crows moves to a new roost site, it generally does so because the area in which it has hunted and scavenged has been depleted of food sources.
 Yes. If the crows move truly because food source has been depleted, they should move outside of the old hunting range. In the stem, the moving is only 8km, well within the hunting range, so this statement should be understandably wrong.

VerbalBot · Answer

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At night, a flock of crows will generally perch close together in a sm

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