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# Parasitic wasps lay their eggs directly into the eggs of

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Senior Manager
Joined: 19 Oct 2004
Posts: 314
Location: Missouri, USA
Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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Updated on: 04 Nov 2004, 10:14
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52
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95% (hard)

Question Stats:

47% (01:09) correct 53% (02:38) wrong based on 2215 sessions

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Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg, If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

A. The size of the smallest host egg that a wasp could theoritically parasitize can be determined from the wasp's egg- laying behavior.

B. Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.

C. Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.

D. Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.

E. Parasitic wasps use visual clues to calculate the size of a host egg.

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Let's get it right!!!!

Originally posted by ruhi on 04 Nov 2004, 05:55.
Last edited by ruhi on 04 Nov 2004, 10:14, edited 2 times in total.
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12 Apr 2005, 07:53
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"A"....wasps egg laying behavior i.e. fewer eggs for smaller host eggs and more eggs in bigger host eggs, there is a direct correlation bet how many eggs a wasps lay in the host eggs with the size of host eggs size. First line gives us that.

"Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg"
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30 Jan 2006, 21:24
1
My pick : A

A. The size of the smallest host egg that a wasp could theoretically parasitize can bedetermined from the wasps egg-laying behavior.

since the wasps somehow know how many eggs to lay in order for their larvae to survive, one can in theory compute the smallest size based on their egg-lay behavior ..

As you can see below - all the other choices can be eliminated with lot more certainity, leaving just "A"

B. Host insects lack any effective defenses against the form of predation practiced byparasitic wasps.

lack of effective defensive mechanism in the host - is out of scope

C. Parasitic wasps learn from experience how many eggs to lay into the eggs of differenthost species.
nothing in the argument talks about how the wasps know how many eggs to lay - hence out of scope

D. Failure to lay enough eggs would lead to the death of the developing wasp larvae morequickly than would laying too many eggs.

- the argument is not about which method will lead to the quicker end of the wasp larvae - so we cannot come to this conclusion that one method will lead to quick death than the other

E. Parasitic wasps use visual clues to calculate the size of a host egg.
- again, how the wasps know how many eggs to lay is out of scope
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Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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07 Dec 2010, 20:20
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Read the question stem: Which of the following conclusions can be drawn ....
So options are conclusions. You are looking for a conclusion that you can draw from the argument. Remember that conclusions do not have any new information. They just infer from data given in the argument.
All B, C, D and E have new information in them which is not mentioned in the argument:
(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.
(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.
(E) Parasitic wasps use visual clues to calculate the size of a host egg.

Argument says:
- Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. (e.g. if the host egg is 2 inches, they lay 1 egg in it, if it is 4 inches, they lay 2 eggs in it etc)

So we can infer that from the wasp's egg laying behavior (1 egg in 2 inch host egg etc ), the size of the smallest host egg can be determined. (It will be the one in which the wasp can lay only 1 egg - 2 inches in our example)
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Re: Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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14 Aug 2012, 10:18
1
That's right.

(A) is making a claim that there is a connection between size of host egg to be parasitized and wasp's egg laying behavior. And we have information to support that in the passage.

Laying a lot of eggs means the size of parasitized host egg must be large. Laying few eggs means size of parasitized host egg must be small.

We basically were able to find a conclusion that could be drawn from the passage - this is the same as an inference question, just rephrased in a different way. With inference questions, we have to find an answer choice that is the "argument/conclusion" and then find information in the passage that would support and make that "argument/conclusion" valid.
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Re: Parasitic wasps lay their eggs directly into the eggs [#permalink]

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24 Aug 2012, 14:04
1
What we learn about the parasitic wasp is that it knows exactly how many eggs to lay depending on the size of the host egg. Therefore, if the wasp lays x number of eggs we know that it will correspond to a certain size of host egg. From this information, we can figure out the largest sized host egg a wasp could parasitize and the smallest host egg it could parasitize. In the case of smallest egg, it would lay only a limited number of eggs. Regardless of that number, it's egg laying behavior, i.e., how many eggs it lays, will give indicate the size of the host egg.

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Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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03 Jun 2015, 21:41
ssriva2 wrote:
The passage always talks about no of eggs then why we are taking "size" in consideration?

The passage talks about the size of the HOST EGG. The wasp lays its own eggs INSIDE a HOST EGG (someone else's egg). How many eggs should it lay depends on the SIZE of the host egg. Say, if the HOST egg is large, it will lay 20 eggs inside it and if the host egg is small, it will lay 10 eggs inside it etc.
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Re: Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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21 Jan 2016, 20:37
1
Shreks1190 wrote:
Can't understand why B is not the right answer. From the statements we can clearly see that the survival rate of the eggs depends purely on the # of eggs laid.
I understand you can eliminate A as well....
Stuck btw A & B

B. Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.

We cannot conclude (B) from the argument. Host insects may have some effective defines. Perhaps, they are able to defend their eggs 8 out of 10 times - we don't know. The argument only tells us how the parasitic wasps lay their eggs whenever they are able to.

On the other hand, we can conclude (A)
A. The size of the smallest host egg that a wasp could theoritically parasitize can be determined from the wasp's egg- laying behavior.
Wasp's egg laying behaviour depends on the size of the host egg. Smaller the host egg, fewer eggs the wasp lays. So theoretically, seeing how it lays fewer and fewer eggs in smaller and smaller host eggs, we can find the size of the host egg in which it can lay only one egg.
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Re: Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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18 May 2017, 03:05
jy295 wrote:
I don't understand how A can be correct, besides using process of elimination. The passage tells us that wasps lay eggs directly into the host egg in exactly the right amount. "A" says that we can figure out the smallest host egg a wasp can theoretically parasitize based on their egg-laying behavior. However, we know that their egg-laying behavior is dependent on the size of the host egg. Therefore wouldn't their egg-laying behavior change for each size of host egg? If that's the case, how could someone use their egg-laying behavior, which is constantly changing, to figure out anything?

The egg laying behaviour has a pattern.
For a small egg (say 3 cm inside radius assuming spherical egg), the wasp lays few eggs, say 2.
For a larger egg (say 5 cm inside radius assuming spherical egg), the wasp would lay more eggs, say 5.
For an even larger egg (say 8 cm inside radius assuming spherical egg), the wasp would lay even more eggs, say 10.
and so on...

Wasps follow this pattern. Extrapolating it, we can theoretically find the size of the smallest egg that a wasp could parasitise.
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Parasitic wasps lay their eggs directly into the eggs of [#permalink]

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17 Oct 2017, 20:56
soodia wrote:
How the size can be determined from behavior?! in the passage we see they just know( based on instinct or experience, we don't know) but I cannot find correlation between choice A and passage

The argument tells us - "Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg"
So if the host egg is large in size, the wasp lays more eggs in it, but if it is smaller in size, the wasp lays fewer eggs inside it.
By observing their behaviour (how many eggs in which size host egg), we can extrapolate to find the size in which the wasp will, theoretically, lay only 1 egg. So any smaller than that and the wasp would lay no egg in it.
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Parasitic wasps lay their eggs directly into the eggs of   [#permalink] 17 Oct 2017, 20:56
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