Parasitic wasps lay their eggs directly into the eggs of : GMAT Critical Reasoning (CR)
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# Parasitic wasps lay their eggs directly into the eggs of

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

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01 Jun 2006, 02:27
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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 theoretically parasitize can be determined from the waspâ€™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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01 Jun 2006, 02:34
To me .. "A" looks a better choice ... since "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." Thus by analysing the egg-laying behaviour an estimate about the smallest host egg can be made.[/b]
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01 Jun 2006, 04:57
why not C?
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01 Jun 2006, 05:09
why not C?
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01 Jun 2006, 06:51
(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the waspâ€™s egg-laying behavior. --> Only A remains. Most important cues are "exactly in right numbers" from the stem and "theoretically paracitize" in the choice - so we are not imfering too much
(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps. --> Nothing is mentioned about the host defense in the stem. Out
(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species. --> This is the trickiest one. Still it is not mentioned "how they learn" . Out
(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs. --> Of the two processes mentioned phenomena mentioned - what happens if too few eggs/too many eggs - there is no relative comparison of which one is worse or better.
(E) Parasitic wasps use visual clues to calculate the size of a host egg. --> Totally hopeless.
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01 Jun 2006, 18:22
Agree with A.
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01 Jun 2006, 18:27
Do we have OA for this question?
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01 Jun 2006, 21:28
go with A as well...
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01 Jun 2006, 21:59
C..
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08 Jun 2006, 02:13
Will have to go with C here.

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.

The bolded part suggests that wasps know irrespective of size on the amount of eggs to lay. This we can infer that they learn from experience....that is after may be killing a lot of hosts.
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11 Jun 2006, 16:19
the OA is A ... this was a tricky one, hisharma and giddi77's explanations are good.
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11 Jun 2006, 18:57
Was having 'B' in my mind.

After some clear explanations on 'A'. 'A' seems to be the clear winner.
11 Jun 2006, 18:57
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