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Deer ticks...

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Deer ticks... [#permalink]

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New post 04 Oct 2009, 23:34



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Please help me to understand the underlying logic of that CR.

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Re: Deer ticks... [#permalink]

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New post 05 Oct 2009, 08:49
The argument is "if the population of other species is increased then it would decrease the no. of ticks acquiring bacterium"..
so it would be beneficial to enquire whether something like this is currently happening?..or in software terms ...we need a "Proof of Concept" for evaluating above argument
this is what the answer says.....hope it helps..
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New post 08 Oct 2009, 21:47
To evaluate the argument it would helpful to know whether Deer Dicks need more number of animals to feed on. If Deer Dick larvae have enough animals to feed on then increasing the population of other animals have no effect.

Hence it would be useful to evaluate the number of animals available for deer dicks larvae to feed on and that is what choice B states
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New post 12 Nov 2009, 07:06
luks like A to me.. but the word 'only' sounds too extreme and disturbing..
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New post 16 Nov 2009, 09:08
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Here's the connection -

Lyme disease----caused by deer ticks---deer ticks acquire it by feeding on bacterium which is in the larval stage----this bacterium uses mice as the host spreading infection

Now to decrease the offset of this disease, the argument states that we will introduce only those species that cannot serve as host carriers for the bacterium. This would lead to the bacterium feeding on inert hosts and therefore lead to a decrease in the number of lyme disease victims

B clearly states the correct evaluation of the argument by pointing out that this would be an effective way only if the host carrier plays a key role in its spread (i.e. the disease can only spread through the host-carrier concept)

Hope it helps

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Re: Deer ticks... [#permalink]

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New post 16 Nov 2009, 17:43
By process of elimination, B is the only one left standing. E is out of scope, while D is simply convoluted. Options A and C do not concern us here.

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Re: Deer ticks... [#permalink]

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New post 24 Nov 2014, 12:54
This problem has a very subtle jump.
currently Deer Ticks (DT) feeds on WM and their population is P.
Now , when we introduce another host(s) , it may happen so that #DT increases. This increase is attributed to a new source of host available. If so is the case then the number of deer ticks may increase thus debilitating the situation further.
OA :- B



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New post 24 Nov 2014, 15:45
Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally, deer ticks pick up the bacterium while in the larval stage by feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.

Which of the following would it be most important to ascertain in evaluating the argument?

So the answer choice we are looking for must strengthen or weaken the argument. The answer choice must show why or why not it will decrease the number of ticks with the bacterium.

A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice
The answer to this question is irrelevant.

B. Whether the size of the deer tick population is currently limited by the availability of animals for the tick's larval stage to feed on.
The conclusion states

Number of uninfected animals goes up = Number of ticks with the bacterium will go down.

If the availability of animals to feed on limits the deer tick population then this will greatly affect the decline of ticks acquiring the bacterium.

C. Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice.
We do not care about controlling the population. The conclusion only cares about the number of ticks acquiring the bacterium by the increase of other species for the larvae to feed on.

D. Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed.
We're only concerned with the larvae feeding on uninfected hosts.

E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmit to humans.
We only care about the bacterium that can cause lyme disease.
Deer ticks...   [#permalink] 24 Nov 2014, 15:45
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Deer ticks...

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