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# Vervet monkeys use different alarm calls to warn

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Vervet monkeys use different alarm calls to warn  [#permalink]

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17 Feb 2017, 12:09
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55% (hard)

Question Stats:

55% (01:20) correct 45% (01:23) wrong based on 543 sessions

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Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.
Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?
A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
B. Different land-based predators are responsible for different numbers of vervet monkey deaths.
C. No predators that pose a danger to vervet monkeys can attack both from land and from the air.
D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

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Re: Vervet monkeys use different alarm calls to warn  [#permalink]

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17 Feb 2017, 22:14

Option D explains the premise of vervet monkeys having two different types of calls, AND the varying responses according to the calls.

Now some people may argue that Option C provides a logical reasoning for the vervet monkeys having two different sets of calls. However we need to assume that Vervet monkeys have 2 different reactions to each alarm calls (which would be D). Even if vervet monkeys have 2 alarm calls, if the reaction is the same, there would be no point in having a different set of calls.

Hope I am right.
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Re: Vervet monkeys use different alarm calls to warn  [#permalink]

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18 Feb 2017, 00:31
C doesn't provide any proof / evidence /premise of having two different alarm calls.

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Re: Vervet monkeys use different alarm calls to warn  [#permalink]

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18 Feb 2017, 06:44
Skywalker18 wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.
Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?
A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
B. Different land-based predators are responsible for different numbers of vervet monkey deaths.
C. No predators that pose a danger to vervet monkeys can attack both from land and from the air.
D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

My take is option D.
In my 2 cents,different alarm calls need to mean something,i.e. difference countermeasures.
Otherwise,why not just one uniform alert !?
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Re: Vervet monkeys use different alarm calls to warn  [#permalink]

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18 Feb 2017, 09:20
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Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.

Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?

Why different alarms for different nature of the attack?
- Maybe they take a different course of action for different types of attacks.

A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching. But this option doesn't throw light on the need of having two different alarms.

B. Different land-based predators are responsible for different numbers of vervet monkey deaths. This option doesn't contribute to the nature of the vervet monkey mentioned in the argument.

C. No predators that pose a danger to vervet monkeys can attack both from land and from the air. This means the set of land attackers is disjoint from the set of aerial attackers. But this doesn't tell us anything about having two different alarms. If they have only one way to escape/avoid the attack, two different alarms don't add anything.

D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage. If they take two totally different actions depending upon the nature of the attack, it becomes necessary that they are warned differently. So they must use different alarms in order to let the other members know what action the members must take.

E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals. Doesn't contribute toward explaining the behavior of the vervet company.

Thus, option D.
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Re: Vervet monkeys use different alarm calls to warn  [#permalink]

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16 Aug 2017, 04:46
2
The correct answer choice is (D). The situation in the stimulus is that
vervet monkeys use different calls depending on where predators come from.
The correct answer must explain why the calls are different (again, difference
versus similarity is an issue). Note that the stimulus does not contain a true
choice (A): This answer states that vervet monkeys vary the calls in order to
indicate the number of predators, but the answer does not explain why
different calls are used for land versus air predators. This answer is attractive
because it shows that different calls can be used to indicate different things,
but it is wrong because it does not explain the behavior of the monkeys as
land-based predators and does not explain the difference described in the
stimulus. Answer choice (C): This answer states that the predators using land
attacks are different from the predators using air attacks, but this information
does not explain why vervet monkeys use different calls to indicate that fact.
Answer choice (D): This is the correct answer. Because vervet monkeys react
to predators in different ways, they would need to know if the predator was
coming by land or air. Hence, the different calls are used to tell the monkeys
whether they should climb trees or dive into the foliage. Since this answer
choice (E): The diet of selected predators of vervet monkeys is irrelevant and
does not help explain why vervet monkeys use different calls depending on
the direction of the attack.
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Re: Vervet monkeys use different alarm calls to warn  [#permalink]

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25 Feb 2018, 18:34
this question sounds unusual, but the main idea behind it is why the monkeys have to use 2 different warn calls.
D explains why. It is b/c monkeys have 2 different reactions to predators.
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Re: Vervet monkeys use different alarm calls to warn  [#permalink]

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15 Aug 2019, 03:28
Skywalker18 wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.
Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?
A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
B. Different land-based predators are responsible for different numbers of vervet monkey deaths.
C. No predators that pose a danger to vervet monkeys can attack both from land and from the air.
D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

I wish all 700 questions on my way were this easy
Re: Vervet monkeys use different alarm calls to warn   [#permalink] 15 Aug 2019, 03:28
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